Mandala Of Indic Traditions
Indian Astronomy Through Ages
by Manikant Shah
Through this essay, I propose to give a brief history of Indian astronomy.
There are a number of books and papers on this subject, which an average visitor
to our website may not have easy access to, or time to consult. Through this
portal of the Mandala we try to briefly highlight the History of Indian Science
and Technology on various themes, as also review relevant books.
Astronomy, the study of celestial phenomena, has played a major role in all
aspects of life in India. It was believed that it was the planetary motions,
which suggested the propitious and unpropitious periods for religious observances.
Planetary configurations were also believed to affect agriculture, architecture
etc. As a result, there developed a science of celestial phenomena on one hand,
and Astrology on the other. In this essay we try to give a glimpse of the evolution
of Indian astronomy. The vast achievements of Indian astronomy are scattered
through a multitude of articles and books and therefore its difficult to condense
them in a few pages. Luckily, we came across an interesting essay on the history
of Astronomy by Rajesh Kochhar, the famous astronomer and Indologist. He has
discussed the history of Indian astronomy under the heads of the Vedic Age,
the Siddhantic Astronomy, the Zij-Astronomy, underlining the Arabic influence,
followed by Modern Astronomy, besides some accounts of Babylonian, Greek, Medieval
and Modern Astronomy. In this brief essay we are trying to give a fair glimpse
of the evolution of Indian astronomy.
This account of the history of Indian astronomy brings out three things clearly:
1) In contrast to the Western Christian-Judaic culture where the man and
universe originated just about 6000 yrs ago, the Indians had the concept of
2) There was intense academic and cultural exchange among Central and West
Asian countries and India, which influenced development of science too; and
3) they were aware of Greek science too and translated Greek works in Sanskrit.
Rajesh Kochhar takes a look at the Pre-Telescopic Astronomy in India. Pre-Telescopic
would mean the period that preceded the invention and the use of Telescope by
Galileo in 1609. While introducing the subject he tells us that the ancient
man's perception of the Universe was based on 'Seeing is believing'. Since the
planetary bodies seemed to go round the earth, the earth was assumed to be the
centre of the Universe. This approach is understood as the geocentric approach
as opposed to the heliocentric approach which, on the contrary believes that
the planetary bodies are going around the Helios - the Sun. We know that
for the ancient people the seven planets: Moon, Mercury, Venus, Sun, Mars, Jupiter,
and Saturn revolved around the earth, arranged in order of increasing geocentric
distance. Beyond Saturn lay the unchanging fixed stars, stitched on the dark
tapestry of the night sky, which in the ancient Indian scheme of things were
observed not for their own sake but as a backdrop for the planetary motions.
Such stars and star groups are called Naksatras. This perception was
all changed during the medieval times when Galileo, Copernicus and Kepler helped
in propounding the heliocentric concept in which the nine planets Mercury, Venus,
Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto go around the Sun -
in an increasing heliocentric distance.
Kochhar points out that the ancient Indian planetary model recognised that
the Moon went around the Earth. It was also correctly assumed in ancient times
that a longer orbital period implied greater geocentric distance for the planet.
Unfortunately, at the current level of knowledge, it is not possible to say
anything about the state of astronomy in the Harappan times that preceded the
I. The Vedic Age
Kochhar concedes that the starting point with regard to astronomy in ancient
India could only be Rgveda. Rgveda stands at the head of the corpus
of Vedic texts which includes, in a rough order of decreasing antiquity, four
Vedic Samhitas: Brahmanas, Aranyakas, Upanisads and Vedangas.
While the astronomical references in the Rgveda and other major Vedic
texts were sporadic and desultory, there existed an ancient, exclusively astronomical,
text called Vedanga Jyotisa ('Astronomy as part of the Vedas'). We are
not told as to how the Vedic people drew their conclusions but as they thought
'seeing was believing', Kochhar says that the Rgveda: 10.161.4 refers
to a year as represented by the return of the seasons. Rgveda repeatedly
referred to Brhaspati as 'the lord of the prayers'. It was not clear whether
Brhaspati's identification with Jupiter had already been made or was a later
development. In Vedic literature Brhaspati was called the 'regent of the Nakshatra
Tisya' (Delta Cancri). Vedanga Jyotisa was the most neglected part of
the Vedic literature. The authorship of the Rgvedic Jyotisa was attributed
to Lagadha, about whom nothing else is known. The book contained an observational
statement that winter solstice took place at the star group Sravistha (Alpha
Delphini). If this statement was taken at face value, it could be dated to c.
1400 BC on the basis of the phenomenon of precession of the equinoxes. Since
we do not know the accuracy of the above observation, this date should be considered
merely indicative. The Vedanga Jyotisa calendar used both the Sun and
the Moon as timekeepers. The Rgvedic year consisted of 12 months, each month
of 30 days, giving a total of 360 days to a year (Rgveda: 1.16. -4.48).
As we know, a year consists of 365 days, while a month, defined as the period
from one new (or full) moon to the next, contains 29.5 days. A solar year thus
can never contain an integral number of lunar months. Twelve months with their
354 days fall short in a year by 11 days. A lunar-solar year must consist of
12 or 13 lunar months. The key question is when to add the extra (intercalary)
To resolve this discrepancy, the Vedanga Jyotisa added two intercalary
months in a period of five years, which thus contained 62 lunar months or 1830
days. Therefore, the Vedanga calendar, with an average year length of 366 days,
accumulated a rather large error of four days in five years.
Vedic Yuga System
The use of the term Yuga is peculiar to the Indian Astronomy that calculates
and denotes vast stretches of time. Kochhar says the basic sense of yuga was
not a fixed unit of time, but any time span that could be associated with a
recurring phenomenon. The word occurs at a number of places in Rgveda,
probably standing for different time periods. Rgveda: 1.158.6 refers
to Dirghatamas 'having grown old in the tenth yuga'. Here, obviously, yuga was
a fraction of human life, may be five or ten years. Vedanga Jyotisa,
seemed to imply a five-year yuga. Atharvaveda mentioned units of100 years,
an ayuta (10,000 years) and then two, three, and four yugas. This suggested
that a yuga here probably meant 10,000 years. The terms Kali, Dvapara,
Treta and Krta were mentioned in the Vedic literature as the designation
of throw of dice marked 4, 3, 2 and 1. Four ages, Pusya, Dvapara,
Khara and Krta, were mentioned in the later portions of Sadvimsa
Brahmana, while Dvapara was mentioned in the Gopatha Brahmana. Interestingly,
the Brahmana literature considered Krta to be something good and the others
increasingly inferior, with Kali the worst. It was however not clear whether
the reference here was to a time-span or a throw of dice.
Yaska's etymological text Nirukta (c.4OO BC) defined Brahma's day as
equal to 1000 yugas, without saying what a yuga was. Manusmrti defined
a unit of time called Mahayuga or caturyuga made up of four yugas Krta,
Treta, Dvapara, and Kali - with lengths in the ratio of 1:2:3:4. The Mahayuga
then contained 1200 X (4 + 3 + 2 + 1) or 12000 divine years. Multiplying it
by 360 gave the number of human years in a Mahayuga. Thus 1 Mahayuga = 43,20,000
years. Next,1000 Mahayugas are set equal to a Brahma's day. 'A Brahma's day
consists of a dawn equal to a Krtayuga followed by 14 Manvantras to each of
which is appended twilight, also equal to a Krtayuga.' The scheme can be continued
to build Brahma's chronology. His Ahoratra would contain 2000 Mahayugas. A total
of 360 Ahoratras would make his one year, and 100 of which his entire life span.
The latter-day mathematical astronomers adopted the concept of a Mahayuga and
a Brahma's day; with one minor change that Brahma's day was given the non-denominational
designation Kalpa. The term Kalpa did not figure in the Vedic texts but was
mentioned in the Mahabharata as a unit of time.
It is interesting to note that Indians had the concept of deep time, in contrast
to the Christian-Judaic Civilisation, in which the universe began only in 4000BC.
Evolution of the Calendrical System
Now a word about the different eras used in India.
Kochar says the oldest inscriptions in India, after the Harappan period, are
the edicts of Asoka put up during his reign (273-236 BC). These inscriptions
are in Prakrit language and Brahmi script. They used a Vedanga calendar: The
years were counted from the king's coronation; no continuous era starting from
a fixed point was used. Within a year, time was reckoned in three seasons of
four months each. Each month was divided into two halves (Paksas). The
month was lunar and Purnimanta - that is, it ended with full moon. Within
a month, days were reckoned by the Tithi, meaning the period from moon-set
to moon-set during the bright half, and from moon-rise to moon-rise during the
dark half. (Division of a lunar month into 30 Tithis came later). The days were
named after the Naksatras. The Vedanga calendar continued to be used by the
successors of the Mauryas, the Sungas and the Kanvas (186 BC-AD 45) and the
Satavahanas ( c. AD 100).
The first era to be introduced in India was the Saka era, brought in by the
Sakas (known to the Greeks as Scythians) who arrived from central Asia. The
Saka era was believed to have originally started in 123BC. In the year 201 of
this era, that is in AD 78, Kaniska subtracted 200 from this number to arrive
at the first year of the Saka era, as we know it. Thus the year 2003 of Gregorian
calendar that is followed globally is equal to Saka era 1925 (2003-78 =1925).
The official Indian calendar follows the Saka Era.
In India Vikrama era is also widely used, which according to the legend was
founded in 57 BC by king Vikrama of Ujjain to commemorate his victory over the
Saka raiders. The legend however has no historical basis. The earliest mention
of the Vikrama era was found in an inscription dated 794 of Vikrama era, or
AD 737, of one king Jaikadeva in Kathiawar. It seems that the earliest name
of the era was the Krta. During AD 405-542, it came to be known as the era of
the Malavas. Its association with Vikrama was first found in AD 737. Its early
use was confined to Kathiawar and Rajasthan. In about AD 824, the Gurjara Pratiharas
of Rajasthan conquered the city of Kannauj, and brought the Vikrama era with
them. It became current in the whole of north India, except the eastern region,
and was used by all the Rajput dynasties of medieval times. The only historical
king Vikramaditya, who was known to have crushed the Saka power at Ujjain, was
king Candragupta-II of the Gupta dynasty (c. AD 395). Many Gupta kings, Samudragupta
onwards, called themselves Vikramaditya. But in their inscriptions they used
the Gupta era, which commemorated the foundation of their empire in AD 319.
The Sun's apparent path around the Earth defines the ecliptic. The Greeks who
literally translated the Babylonian sign names adopted the Babylonian concept.
The name zodiac is credited to the astronomer Cleostratos (c. 530 BC). The zodiacal
signs came to India in the post-Alexandrian period. The traditions of the Graeco-Mesopotamian
astronomy were preserved in two Sanskrit texts. In AD 149/150, in the reign
of Rudradaman-I, probably at Ujjain, one Yavanesvara translated a long Greek
astrological text into Sanskrit prose. In AD 269/270, Sphujidhvaja versified
a large part of this text in a text entitled Yavana-jataka, which is
II. Siddhantic Astronomy
The rather simple Sun and Moon-oriented astronomy of the Vedanga eventually
made way for the mathematically rigorous planetary astronomy of the Siddhanta
(Siddhanta, literally meaning 'proven in the end'), was the name given
to the astronomical texts of the period. The Indian astronomical tradition,
like the intellectual tradition in general, was entirely oral. Astronomical
texts were composed in terse verse, often in metrical form. To facilitate teaching,
commentaries were composed on famous texts. As long as an astronomical text
was in use, it was memorized. Very often, the text was forgotten except for
fragments incorporated into or cited in other texts. In many cases, an astronomer
could only be assigned approximate relative chronology on the basis of cross-references
in dateable texts. The Arab countries gave due regard to Indian science and
Indian scientists. They invited Indian scholars to head their academies and
doctors to direct their big hospitals. Through them much of Indian science was
spread to the West too, though there it was often taken only as Arab science.
This provided a rich Arab-Persian corpus of Persian/ Arabic translation of the
Sanskrit texts on the Siddhantic period. In addition, Al-Beruni provided valuable
information on astronomy as on everything else. Kosthakas or Sarinis
were sets or astronomical tables for determining planetary positions or solving
other problems in astronomy.
The early Siddhantic period is rather poorly recorded. No contemporaneous texts
are extant nor are its astronomers identifiable. Whatever we know about this
period is from later texts, which call the early texts a-pauruseyas,
'non-human' or divine. It is therefore necessary to acquaint ourselves with
the historical-period texts and authors before we can learn about the a-pauruseya
The historical era began with Aryabhatta (b. AD 476) whose text Aryabhatiya
AD 499 (meaning Aryabhata's work) was the first astronomical work attributed
to a single author and accurately dated. Asmaka was called Assaka in Pali texts,
which placed its capital Pratisthana (modem Paithan) on river Godavari. Varahamihira
in his Brhat-samhita placed Asmaka in the north-west region of India.
The illustrious names in Siddhantic astronomy, following Aryabhatta, were his
direct pupil Latadeva (AD 505); Varahamihira (d. AD 587), a compiler rather
than researcher, and an expert on omens; Bhaskara-I (AD 629), Aryabhatta's commentator
and an able mathematician; Aryabhatta's bete noire Brahmagupta (b AD
598); Lalla (AD 638 or 768); Manjula or Munjala (AD 932); Aryabhatta-II (c.
AD 953); Sripati (AD 1039); and Bhaskara-II (b. 1114), author of the celebrated
mathematical work Lilavati. A powerful school of astronomy, mostly based on
Aryabhatta's system, flourished in Kerala from thirteenth century right into
the nineteenth. It included such illustrious names as Paramesvara (who in AD
1413 introduced the Drgganita system) and Acyuta Pisarati (d.1621). Many
astronomers composed commentaries on earlier authoritative works. Among the
commentators were such well-known names as Prthudaka (AD 864) in Kannauj and
Bhagotpala (AD 966) in Kashmir.
The basic observational input into the Siddhantic theory was the orbital periods
of the geocentric planets, which would have been obtained by actual observation.
However, instead of saying that Saturn's period was 29.47 years, a Siddhantic
astronomer would, for instance, say that Saturn made 146,564 revolutions in
a Mahayuga. After the lapse of a long period of time (like a Mahayuga),
during which the planets made an integral number of revolutions the planets
returned to the original alignment. In a text no longer extant, Aryabhatta also
propounded the Ardha-ratrika (midnight) system in which the beginning
of Kaliyuga was placed six hours earlier, at the midnight of 17/18 February
3102 BC. Modern simulations have shown that the planets were not in conjunction
in 3102 BC. The date 3102 BC has earned a non-astronomical connotation because
of Aryabhatta's peculiar way of describing it.
We can now introduce the various schools, or Paksas, of the classical
Siddhantic astronomy: Brahma, Arya, Ardha-ratrika,
and Saura. Aryabhatta's Aryapaksa and Ardha-ratrika-paksa differed from
the Brahma-paksa in two important aspects: Aryabhatta set a Kalpa equal to 1008
Mahayugas (or 72 Manvantaras).
Our chief source of information is Varahamihira's compendium, aptly called
Panca-Siddhantika, because it described the five (panca) ancient
Siddhantas. Arranged in order of increasing accuracy they were the Paitamaha,
Vasistha, Romaka (of the Romans), Paulisa (by Paulus), and Surya.
Brahmagupta cited the Paitamaha on Mars and other planets, which did not figure
in Varahamihira's summary. The Siddhanta was cast in the form of a lecture by
God Brahma to Bhrgu. The Panca-Siddhantika devoted 13 verses to the Vasistha-Siddhanta
whose date was 3 December AD 499. From the post-Varahamihira period, we had
a Vasistha-siddhanta by Visnucandra (before Brahmagupta's time) and a
later work, Vrddha-Vasistha-siddhanta.
A large part of Panca-Siddhantika was devoted to the Paulisa, which
used a sidereal year. It continued to be current up to the time of Bhattotpala
(AD 966) who quoted from it. No text of this Siddhanta is now extant. Of the
five Siddhantas mentioned by Varahamihira, the Surya-siddhanta alone
has survived. It was supposed to have been described by the Sun-god himself
to Asura Maya, the architect of the gods, who in turn revealed it to the Indian
Risis. It was recast into the Ardha-ratrika system (dated midnight 20/21
March AD 505) by Latadeva.
The Siddhantic astronomical tradition was alive till as late as 1825, when
John Warren found a 'Calendar maker residing in Pondicherry' who showed him
how to compute a lunar eclipse by shells placed on the ground, and from tables
memorized 'by means of certain artificial words and syllables'.
The credit for discovering the fact that the earth rotates on its axis goes
to Aryabhatta. This observation was mentioned at three places in Aryabhatiya.
The Skanda-purana (18.104.22.168), described the Earth as revolving like
a Bhramarika (spinning top). The concept of Earth's spin, however, ran counter
to the received wisdom on the subject. Varahamihira and Brahmagupta even listed
physical arguments as to why the Earth could not be in motion. Aryabhatta's
belief in Earth's rotation was generally a source of embarrassment to his followers
down the ages. Kochhar points out that it should however be kept in mind that
Aryabhatta's belief in the Earth's rotation was at the level of a hypothesis,
acceptance or negation of which had no bearing on the planetary calculations.
The Vedic mythology attributed the eclipses to a demon Rahu, who was explicitly
named in Atharvaveda. The correct mathematical theory of eclipses was
first given by Aryabhatta in the Indian context. He pointed out that for an
eclipse to occur, the moon should be at one of its nodes, that is, at one of
the two points where the lunar orbit intersects the ecliptic. Subsequently,
the term Rahu was borrowed from the Vedic texts and applied to the lunar node,
especially the ascending node (when the moon crossed the ecliptic moving northwards).
At the same time, the mythology was modified to keep pace with the scientific
developments. The old single demon Rahu was cut into two, the head Rahu and
the torso Ketu to correspond to the two nodes. The concept of Rahu and Ketu
travelled outside India also. Interestingly, while Rahu stood for the ascending
node, Ketu denoted the lunar apogee, an identification not known in India.
Throughout the Siddhantic period, instruments and observations played second
fiddle to computations. Although Bhaskara-II was credited with devising a rather
versatile instrument, Phalaka-yantra, but observational astronomy came
into its own only in the medieval times, again thanks to India's interaction
with central and west Asia.
III. Zij Astronomy
As we have seen there was an active scientific exchange of India with the Arab
world. The post-Siddhantic astronomy had been referred to by a number of names,
most of which were misnomers. 'Arab astronomy' was not a correct expression
because most of the astronomers in this period were non-Arabs. According to
Ibn Khaldun (1332-1406) 'It is a remarkable fact that, with few exceptions,
most Muslim scholars both in the religious and in the intellectual sciences
have been non-Arabs.' Kochhar says the term 'Islamic astronomy' was politically
incorrect, and in the Indian context factually wrong as well because, contrary
to the popular belief, this astronomy was Sanskritized'. The more recent term
like 'central and west Asian astronomy' appears laboured, and is spatially restrictive.
The most appropriate term therefore, was 'Zij astronomy', because the main occupation
of astronomers in this phase was the preparation of Zijes-that is, mathematical
There are three types of Zijes: (i) Zij-e-Rashadi (direct tables) based on
actual observations; (ii) Zij-e-Hisabi (calculated tables) obtained by correcting
observational tables for errors, precession, etc.; and (Hi) Zij-e-Tas'hil (simplified
tables) which were the simplified versions of other tables - like the one which
could deal with the Moon alone.
The Zij period began in Baghdad under the auspices of the Abbasid Caliphate.
To place the astronomical developments of the period in the political context,
we may note the sequence of the early Abbasid Caliphs: Al-Saffah (750-54), Al-Mansur
(754-74), Al-Mahdi (775-85), Al-Hadi (785-86), Harun-Al-Rashid (786-809), and
The starting point of the Zij astronomy in India was the translation of first
the Sanskrit and then the Greek texts into Arabic. The Arabic bibliographical
tradition recorded the name of an Indian astronomer Kankah-al-Hindi (c. 775-820),
who was not known to Indian sources at all. The first regular astronomer to
be known in Arabic was Brahmagupta whose Brahmasphuta-siddhanta was the
basis of a work entitled Maha-siddhanta composed in the late seventh
or early eighth century. This work was in turn the basis of Zij Al-Sindhind
Al-Kabir composed by Al-Fazari during the reign of Al-Mansur. The Aryabhatiya
was translated into Arabic as Zij Al-Arbhar in about AD 800.
The first astronomical tables in Arabic were prepared by translation from Sanskrit
by Muhammad ibn-Musa Al-Khwarizmi (780-850). Al-Khwarizmi's tables constituted
a landmark in the world history of astronomy and mathematics they represented
the westward migration of the Indian numerical system, including zero. Interestingly,
while these numerals were called Hind-se (from India) in Arabic, they
were termed Arabic in Europe, acknowledging the supplier rather than the originator.
(By the way, the English term Algorithm was derived from Al-Khwarizmi).
One of the greatest Zij astronomers was Muhammad ibn-Jabir ibn-Sina Abu-Abdallah
Al Battani (d. 928), known to Europe as Albategnius. Umar Al-Khayyam, better
known as a poet for his Rubaiayat (A loaf of Bread beneath the Bough,
A Flask of Wine, a Book of Verse and Thou) than as an astronomer, was the
director of an observatory built by Malik Shah of Saljuki dynasty. His work
came to be known as Zij-e Khayyam. Assiduous observations lasting a dozen
years resulted in the influential Zij-e-llkhani. It consisted of four
maqales (chapters) dealing with different eras; stellar, longitudes;
and astrological predictions. Each maqala was supplemented with a number
A hundred years later, Zij-e-Ilkhani was amended by Ghyathuddin Jamshid
bin Masud Al-Kashi (d.1429) under the (abbreviated) title Zij-e- Khaqani.
This Zij was completed at Samarqand where Al-Kashi was invited to assist Ulugh
Beg (1394-1449), the most outstanding observational astronomer of the medieval
times. At Samarqand, Ulugh Beg built a madrasah (university) in 1420
and an observatory in 1424. Ulugh Beg's observational Zij was finally completed
in 1436. It goes by different names. Ulugh Beg's work was also called Zij-e-Gurgani
after Gurgan, a title used by Timur. It formed the basis of most subsequent
catalogues, and was used even by Johan Flamstead (1646-1719), the first Astronomer
Royal at Greenwich Observatory. Ulugh Beg's work held sway for close to three
centuries, when it was supplanted by telescopic data.
Development of Zij Astronomy in India
India's introduction to Zij astronomy came about at the hands of Al-Beruni
(973-1048) who himself wrote Zij-e Masudi, also called Qanun-al-Masudi.
India's first Zij was prepared by one such asylum-seeker, Mahmud bin Vmar. The
work was called Zije-Nasiri after the Sultan of Delhi Nasir AI-Din Abul-Muza
Mahmud bin Shams AI-Din Iltutmish (reign 1246-65). Zij astronomy took root in
India under the patronage of Feroze Shah Tughlaq who ruled from Delhi from 1351
to 1388. It was during this period that the versatile portable astronomical
instrument Ustarlab or the astrolabe was introduced to India. Mahendra Suri,
the head astronomer at the royal court, prepared in 1370 a monograph on astrolabe,
titled Yantra-raja. This was the first Sanskrit work exclusively devoted
to instrumentation, and was the subject of many later commentaries. In about
1400, Padmanabha described an astrolabe whose design was different from Suri's
and therefore taken from a different source. More importantly, he also described
an instrument, dhruva-bhramana-yantra, which measured time by an observation
of the star group 'polar fish', that included the bright pair Alpha and Beta
Vrsae Minus. Some Sanskrit texts describing astronomical instruments are given
in Table 1.
Humayun's astronomer Mulla Chand used an astrolabe to determine the time of
Akbar's birth. Chand was also Akbar's court astronomer. Shah Jahan's court astronomer
Fariduddin Masud bin Hafiz Ibrahim Munajjim (d. 1627) computed his Zij-e
Shah Jahani based on Ulugh Beg's observations. This Zij was translated into
Sanskrit by Nityananda (c.1639). He also gave detailed classification of all
Zijes compiled till his time.
Jai Singh's Observatories
From the eighteenth century, we have Raja Jai Singh Sawai's (1688-1743) treatise
on instruments, Yantra-prakara, essentially completed before 1724. In
1732, his astronomer Jagannatha translated Al-Tusi's Arabic recension of Almagest
into Sanskrit under the title Samrata-siddhanta, adding a supplement
to it describing various instruments.
Jai Singh set up a number of (pre-telescopic) masonry-type observatories. The
Delhi observatory established during 1721-24 was followed by a bigger one built
during 1728-34 at his capital Jaipur. He built smaller ones at Mathura, Ujjain
and Varanasi between 1723 and 1734. The Varanasi observatory was set up on the
terrace of Manamandira, a palace built by Jai Singh's ancestor Man Singh (1550-1614);
it was likely that he renovated an old observatory. Jai Singh's observatories
were modelled after those of the 'martyr-prince' Ulugh Beg.
Jai Singh's interest in astronomy was no doubt genuine yet there was an element
of irony in Jai Singh's nomenclature for his astronomical work. From a scientific
point of view, the most remarkable feature of Jai Singh's astronomy was its
anachronism. Jai Singh failed to recognize the significance of European developments.
Jai Singh's edifice of science did not survive for long. In 1745, two years
after Jai Singh's death, Emperor Muhammad Shah invited Father Strobl to come
to Delhi and take charge of the observatory.
IV. Advent of Modern Astronomy
It is significant that the first British merchant ship reached India the same
year as the telescope was invented in the Netherlands. The needs of the maritime
trade acted as a great incentive for growth of modern astronomy. Observatories
were set up at Paris (1667) and Greenwich (1675) to solve the problem of the
longitude at sea, and many young men seeking employment with the (British) East
India Company took tuition from the Astronomer Royal. Modern astronomy came
to India in tow with the Europeans.
The early use of telescopic astronomy in India was desultory, sporadic and
often motivated by personal curiosity. In the nineteenth century there was widespread
use of science by the British to further their commercial and political interests.
Indians came into contact with modern science, when they were assigned the peripheral
role of providing cheap labour. Once introduced to modern science, Indians finally
strove to become full-fledged members of the international republic of science
in their own right.
Finally, contributing his critique to the chapter Kochhar points out that at
critical junctures in its history, astronomy received impetus for its ability
to successfully negotiate human fear of natural forces. Whenever cultural areas
felt self-assured, they advanced astronomy. In earlier times society lent its
support for astronomy for calendrical and astrological reasons. Since ancient
man felt insecure on Earth, he felt scared of the gods also. As astronomical
knowledge increased, astrology also became more intricate. Belief in astrology
thus kept astronomy alive. The only lean period astronomy experienced in India
was when Buddhism held sway. Modern science rightly dubs astrology as a pseudo-scientific
The early awe of astronomical gods left its mark on the Siddhantic period.
One wonders whether the society's support for astronomy in the name of astrology
prevented the astronomers from challenging the existing paradigms.
In earlier times, astronomical knowledge was not treated as scientific deduction,
but as divine revelation. How a purely scientific work was slowly made extra-scientific
was illustrated by the reaction of Bhaskara-I, a great authority on Aryabhatta.
A remarkable feature of pre-telescopic astronomical activity in India was its
interaction with the work abroad. The Zij period had begun in Baghdad with the
translation of Sanskrit texts. It came to a close at Delhi and Jaipur with the
translation of Ulugh Beg's tables into Sanskrit.
Rajesh Kochhar Pre-Telescopic Astronomy In India. 2001. In History of Science,
Technology and Culture (Ed.) A. Rahman. New Delhi: Oxford. Pp. 171-197.
Kochhar, R. and J. Narlikar. 1995. Astronomy in India: a Perspective.
Sen. S.N. and K.S. Shukla. 1985. History of Astronomy in India. Delhi:
Table 1. Sanskrit Texts For Astronomical Instrumentats
||Based on Cakradhara's work
|Tr. of Almagest with suppl.
||Yantra-raja rasala-bias-baba or
|Astrolabe (Tr. of MSS by
Nasir al Din Al-Tusi
13th cent., Iran)
Lok Vigyan Kendra