Astronomy is all about thinking big, both in time and - TopicsExpress

Astronomy is all about thinking big, both in time and space. The Earth turns on its axis, the Moon passes through its phases, and the planets come into opposition and solar conjunction on a routine basis. Of course, on the other end of the spectrum, there are some events which traverse such colossal spans of time that the mere mortal life span of measly homo sapiens such as ourselves can never expect to cover them. Many comets have periods measured in centuries, or thousands of years. The axis of the Earth wobbles like a top, completing one turn every 26,000 years in what’s known as the Precession of the Equinoxes.

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