Anti-sidereal timeとは 意味・読み方・使い方

Anti-sidereal time and extended-sidereal time are artificial time scales used to analyze the daily variation in the number of cosmic rays received on Earth. Anti-sidereal time has about 364.25 days per year, one day less than the number of days in a year of solar time, 365.25. Thus each anti-sidereal day is longer than a solar day (24^h) by about four minutes or 24^h4^m. Extended-sidereal time has about 367.25 days per year, one day more than the number of days in a year of sidereal time, 366.25. Thus each extended-sidereal day is shorter than a sidereal day (23^h56^m) by about four minutes or 23^h52^m. All years mentioned have the same length.