astronomical day definition

  • adjective:
    • See under Day.
    • See under Day.
  • noun:
    • a period of time add up to the mean solar power day, but starting at noon in place of at midnight, its twenty-four hours being numbered from 1 to 24; additionally, the sidereal time, as that a lot of used by astronomers.
    • a period of time add up to the mean solar day, but starting at noon in place of at nighttime, its twenty-four hours being numbered from 1 to 24; in addition, the sidereal day, as that many employed by astronomers.
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