The Concept People used to believe that comets were unpredictable foreshadowings of dreadful things to come. They are icy creatures that emit gas or dust, hence their nickname ‘dirty snowballs’.
The Story For much of history, comets were viewed as unpredictable omens of doom, but the Indian polymath Varahamihira treated them like a laboratory subject. In his 6th-century masterpiece, the Brihat Samhita, he documented over 1,000 different types of comets, classifying them by their tails, shapes, and the specific regions of the sky they emerged from. He even described their tails as “smoke” (Dhumaketu), predating the modern understanding of comets as “dirty snowballs” that outgas as they approach the Sun. While Europe waited until 1705 for Halley to predict a comet’s return, India had been cataloguing these cosmic visitors for millennia.
The Timeline
| Milestone | Details |
| Western Ref. |
1705 CE (Halley’s prediction) |
| Indian Source |
500 CE (Varahamihira); Prior to 10,000 BCE (Atharva Veda) |
| Chron. Gap |
Over 11,000 Years |
The Original Text
The Brihat Samhita (Chapter 11) provides a detailed classification of comets under the heading ‘Ketur…’.
Related Innovations The Brihat Samhita (c. 550 CE) classified comets (Dhumaketu) by describing their tails as ‘smoke’ and recognised the periodicity of distinct celestial bodies, indicating their recurrence after predetermined intervals.
Fun Fact Varahamihira was the first person in the ancient world to compile a list of over 1,000 different types of comets.
The Modern Legacy The study of comets forms the foundation of modern science. It helps us understand the early formation of the solar system and the origin of water on Earth.
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