Star's Day

Star's Day
   The true rotation period of a planet, determined by the time between appearances of a star in the same place in the sky. Since the rotation of the Earth is gradually slowing down, a day in the past was shorter than now, and in the future it will be longer. Today a day is actually 23 hours and 56 minutes long, but 900,000,000 years ago a year was made of 481 eighteen hour days. Also called Sidereal Day.

The writer's dictionary of science fiction, fantasy, horror and mythology. 2014.

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