Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
  • Black's Law Dictionary: 2nd Edition

    The two periods of the year (vernal equinox about March 21st, and autumnal equinox about September 22d) when the time from the rising of the sun to its setting is equal to the time from its setting to its rising. See Dig. 43, 13, 1, 8.