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A solar equinox is a moment in time when the Sun crosses the Earth's equator, which is to say, appears directly above the equator, rather than north or...

The September equinox (or southward equinox) is the moment when the Sun appears to cross the celestial equator, heading southward. Because of differences...

positions of the celestial equator and (March) equinox with fully updated precession and nutation are called the true equator and equinox; the positions without...

the perturbing body (north or south of equator) α, right ascension of the perturbing body (east from March equinox). The three unit vectors of the torque...

the March equinox, and it has a right-hand convention. It may be implemented in spherical or rectangular coordinates. The celestial equator and the ecliptic...

mean equator and equinox on a particular date. TEME: the ECI frame used for the NORAD two-line elements is sometimes called true equator, mean equinox (TEME)...

In astronomy, an equinox is either of two places on the celestial sphere at which the ecliptic intersects the celestial equator. Although there are two...

Consequently, the Equator has a rather stable daytime temperature throughout the year. On the equinoxes (approximately March 20 and September 23) the...

language of Nigeria True Equator, Mean Equinox frame used in the Earth-centered inertial coordinate system Trade Union for Theatre and Media (Teme), Finland...

projection of Earth's equator onto the celestial sphere (forming the celestial equator), a primary direction towards the March equinox, and a right-handed convention...

(degrees) = about 2160 years. This means the Sun crosses the equator at the vernal equinox moving backward against the fixed stars from one year to the...

The origin on the celestial equator for GAST, termed the true equinox, does move, due to the movement of the equator and the ecliptic. The lack of motion...

equator. When the Sun crosses the equator at both equinoxes, the Sun's daily shift (relative to the background stars) is at an angle to the equator,...

reference, such as coordinate systems specified by "equinox", or "equinox and equator", or "equinox and ecliptic" – when these are needed for fully specifying...

between the equator and the North Pole, but the true halfway point is 16.0 km (9.9 mi) north of it (approximately between 45°08'36" and 45°08'37") because...

overhead at solar noon at the Equator on the equinoxes, at the Tropic of Cancer (latitude 23°26′09.9″ N) on the June solstice and at the Tropic of Capricorn...

the Equator, where the equinox Sun rises due east and sets due west, at a right angle to the horizon. Each stage of twilight (civil, nautical, and astronomical)...

of the Galactic longitude by 32° and the latitude by 1.5°. In the equatorial coordinate system, for equinox and equator of 1950.0, the north galactic pole...

March or September before the equinoxes the Sun's declination is less than 8°34' from the Equator; During the equinoxes, astronomical dawn to sunrise...

direction and completes one revolution relative to the Vernal Equinox and the stars in about 27.32 days (a tropical month and sidereal month) and one revolution...