Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He is known for his work on the classification of stars, which he divided into six categories based on their brightness.

Bhaskara II was an Indian astronomer and mathematician who lived in the 12th century. He was the first to observe and describe sunspots, which he called 'black spots on the Sun'.

Aryabhata was an Indian astronomer and mathematician who lived in the 5th century. He was the first to propose that the Earth revolves around the Sun, which was a revolutionary idea at the time.

Varāhamihira was an Indian astronomer and astrologer who lived in the 6th century. He was the first to observe and describe the transit of Venus, which is a rare astronomical event that occurs when Venus passes between the Earth and the Sun.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the supernova of 1054, which was a very bright supernova that was visible in the night sky for several months.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the Crab Nebula, which is a supernova remnant that is located in the constellation Taurus.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the Orion Nebula, which is a large and bright nebula that is located in the constellation Orion.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the Andromeda Galaxy, which is the closest major galaxy to our own Milky Way galaxy.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the Large Magellanic Cloud, which is a satellite galaxy of our own Milky Way galaxy.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the Small Magellanic Cloud, which is a satellite galaxy of our own Milky Way galaxy.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the Milky Way galaxy, which is our own galaxy.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the zodiacal light, which is a faint glow of light that is visible in the night sky along the ecliptic.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the Gegenschein, which is a faint glow of light that is visible in the night sky opposite the Sun.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the aurora borealis, which is a natural light display that is visible in the night sky in high-latitude regions.

Nilakantha Somayaji was an Indian astronomer and mathematician who lived in the 15th century. He was the first to observe and describe the aurora australis, which is a natural light display that is visible in the night sky in high-latitude regions.