The adjective sidereal can refer to various things, including:

• Measurements of time:
  • Sidereal time
  • Sidereal day
  • Sidereal month
  • Sidereal year
• Sidereal period of an object orbiting a star
• Sidereal astrology
• Sidereus Nuncius, or Sidereal Messenger, a scientific work by Galileo Galilei
• Sidereal Exalted, from the fantasy role-playing game Exalted

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