I wish to pay a tribute to the many of the earliest Indian astronomers that made discoveries that were far ahead of their western counterparts.
This post is dedicated to these Great Hindu Pioneers of Science:
ARYABHATT (476 CE)
MASTER ASTRONOMER AND MATHEMATICIAN

Born in 476 CE in Kusumpur (Bihar) Aryabhatta is widely recognized as the father of Indian astronomy. Aryabhatt's intellectual brilliance remapped the boundaries of mathematics and astronomy. In 499 CE, at the age of 23, he wrote a text on astronomy and an unparallel treatise on mathematics called "Aryabhatiyam." He formulated the process of calculating the motion of planets and the time of eclipses. Aryabhatt was the first to proclaim that the earth is round, it rotates on its axis, orbits the sun and is suspended in space - 1000 years before Copernicus published his heliocentric theory.
He is also acknowledged for calculating p (Pi) to four decimal places: 3.1416 and the sine table in trigonometry. Centuries later, in 825 CE, the Arab mathematician, Mohammed Ibna Musa credited the value of Pi to the Indians, "This value has been given by the Hindus." And above all, his most spectacular contribution was the concept of zero without which modern computer technology would have been non-existent. Aryabhatt was a colossus in the field of mathematics.
On April 19, 1975, India sent its first satellite into orbit, named ‘Aryabhatta’
VARAHAMIHIR (499-587 CE)
EMINENT ASTROLOGER AND ASTRONOMER

Renowned astrologer and astronomer who was honored with a special decoration and status as one of the nine gems in the court of King Vikramaditya in Avanti (Ujjain). Varahamihir's book "panchsiddhant" holds a prominent place in the realm of astronomy. He notes that the moon and planets are lustrous not because of their own light but due to sunlight. In the "Bruhad Samhita" and "Bruhad Jatak," he has revealed his discoveries in the domains of geography, constellation, science, botany and animal science. In his treatise on botanical science, Varamihir presents cures for various diseases afflicting plants and trees. The rishi-scientist survives through his unique contributions to the science of astrology and astronomy.
ACHARYA BHARADWAJ (800 BCE)
PIONEER OF AVIATION TECHNOLOGY

Acharya Bharadwaj had a hermitage in the holy city of Prayag and was an ordent apostle of Ayurveda and mechanical sciences. He authored the "Yantra Sarvasva" which includes astonishing and outstanding discoveries in aviation science, space science and flying machines. He has described three categories of flying machines: 1.) One that flies on earth from one place to another. 2.) One that travels from one planet to another. 3.) And One that travels from one universe to another. His designs and descriptions have impressed and amazed aviation engineers of today. His brilliance in aviation technology is further reflected through techniques described by him:
1.) Profound Secret: The technique to make a flying machine invisible through the application of sunlight and wind force.
2.) Living Secret: The technique to make an invisible space machine visible through the application of electrical force.
3.) Secret of Eavesdropping: The technique to listen to a conversation in another plane.
4.) Visual Secrets: The technique to see what's happening inside another plane.
Through his innovative and brilliant discoveries, Acharya Bharadwaj has been recognized as the pioneer of aviation technology.
Source:
http://www.hinducounciluk.org/newsite/circulardet.asp?rec=44