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

Tycho Brahe

Explanation:

Tycho Brahe was born in Denmark and became Danish nobleman, astronomer. He was also known for his scientific and extensive astronomical observations. After receiving Hven island from King Fredrik, he built an observatory on the island to watch the sky. For over 20 years, Brahe used the island for observing the positions of moon, sun and planets.

although the crusades failed to capture jerusalem, they had several major impacts on western europe. they increased the authority of the king: sometimes nobles died in battle without leaving an heir in which case the king got their land. kings passed taxes to pay for the crusades.

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.