Some early astronomers were certain that intelligent beings lived on Mars.

It is this apparently anomalous motion that so mystified early astronomers.

It is certain that the earliest astronomers regarded the earth as round.

To the early astronomers it was just another star.

He and Tom began to discuss the early astronomers.

It may have been a surname given to early shamanistic astronomers to the Pole tribes.

What units of measurement did the early astronomers use to make those early calculations?

The museum explains the vivid history of the instruments used by early astronomers and scientists of the country.

Other open clusters were noted by early astronomers as unresolved fuzzy patches of light.

It is merely a question of discovering the laws of its motion, as the early astronomers discovered the solar year.