+**Days and Nights** are the fundamental divisions of a [Solar Day](/wiki/solar_day) on [Earth](/wiki/earth), marked by the presence or absence of sunlight. This rhythmic alternation is caused by a celestial body's rotation on its axis as it orbits a star, bringing different parts of its surface into and out of direct illumination.
+## See also
+- [Rotation](/wiki/rotation)
+- [Orbit](/wiki/orbit)
+- [Time](/wiki/time)
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