Sidereal Time Discipline: Education Solar Time and Sidereal TimeSolar time is based on the position of the sun. Local noon in solar time is the moment when the sun is at its highest point (the upper meridian) in the sky. Solar time is what the time we all use where a day is defined as 24 hours, which is the average time that it takes for the sun to return to its highest point. Tags: vernal equinoxsidereal dayrotationsolar timemeridian
The Equatorial Coordinate System Discipline: EducationThe equatorial coordinate system is what astronomers use to keep track of the positions of objects in the sky. Astronomers imagine that the Earth is surrounded by a large sphere called the celestial sphere. The Earth's equator and the plane of the Earth's orbit are projected onto this sphere. Tags: right ascensiondeclinationcelestial spherecelestial equatorvernal equinoxautumnal equinoxsummer solstice
