What two important astronomical discoveries did the guptas make?

the earth is round.

the earth revolves around the sun.

the earth revolves around the moon.

the earth spins on an axis

The Gupta astronomers made many advances in astronomy, using their mathematical knowledge.

It was during this empire that the philosophers of India proposed the idea that the earth was not flat, but was round and rotating on an axis which allowed to see the lunar eclipses.

The answer is: The earth is round, and the Earth spins on an axis.

- "the most famous structure by far at saqqara is djoser's step pyramid. dating from the 3rd dynasty (2667—2448 bc), it was the first all-stone complex ever built on earth."

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"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.