Sidereal

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Sidereal, of the stars, may refer to:

Measurements of time:
- Sidereal time
- Sidereal day
- Sidereal month
- Sidereal year
Sidereal period of an object orbiting a star
Sidereal and tropical astrology
Sidereus Nuncius, or Sidereal Messenger, a scientific work by Galileo Galilei

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