Longitude
Great circles that pass through both the north and south poles, also called meridians.
Great circles that pass through both the north and south poles, also called meridians.
The point of the Moon's orbit farthest from Earth is called apogee.
A lunar eclipse occurs when Earth comes between the Sun and the Moon and blocks the Sun's rays from shining ...
The point of the Moon's orbit closest to Earth is called perigee.
Messier Catalog entry number 100 is a spiral galaxy in the Virgo cluster seen face-on from our solar system.
Two small, irregular galaxies found just outside our own Milky Way galaxy. The Magellanic Clouds are visible in the skies ...
The difference between true north and magnetic north is called magnetic declination or magnetic variation.
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