恒こう星せい時じこうせいじMeanings1nounsidereal timeTechnical term in astronomy; time measured relative to the fixed stars rather than the sun.恒こう星せい時じは、春しゅん分ぶん点てんの時じ角かくで定てい義ぎされる。Sidereal time is defined by the hour angle of the vernal equinox.
