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Sidereal time is based upon the orientation of the rotating Earth relative to the stars.
Celestial coordinates are given in Right Ascension and Declination which are analogous to the familiar longitude and latitude system used for specifying a position on the Earth's surface. The Declination of a star at the celestial equator is zero degrees. As a result the sky is divided like an orange with 24 segments. Each hour of R.A. in turn is divided into 60 minutes each and the minutes are divided into 60 seconds. Hours of R.A. increase in value from west to east and are numbered 0 through 23.