A total solar eclipse will turn afternoon skies dark from Texas to Maine on Monday. During the eclipse, the moon will cross between the Earth and the sun, completely blocking out the sun's light.

In contrast, during a total solar eclipse — which is preceded by a partial eclipse — the moon completely covers the sun, ...

Elongation is the angle, in degrees, between the Sun and the planet as seen from here on the Earth. Superior planets (those that lie further from the Sun than us: Mars, Jupiter, Saturn, Uranus, ...