Which 17th century astronomer kept a roughly 20 year continuous record of the positions of the sun, moon, and planets?

Why was the battle of gaugamela an important turning point in alexanders conquest of persians empire

Identify the type of source based on the information provided. a historian found a journal belonging to an ancient indian princess. the princess liked to keep a record of all the royal women of her dynasty who lived before her time. she tried to collect as much accurate information about their history as possible. her journal is a great source of historical information. based on the passage, the princess’s diary is source.

Why did kennedy choose lyndon b. johnson to be his running mate