have seasons in the way that we do and life on this planet could have developed much differently to account for more constant weather and climate conditions at each latitude of our planet The earliest September equinox will be 21 September 2096 while the latest was 23 September 2003 (Day is usually defined as the period when sunlight reaches the ground in the absence of local obstacles.These effects make the day about 14 minutes longer than the night at the equator and longer still towards the poles. The mean ecliptic is defined by the The equinoxes are sometimes regarded as the start of spring and autumn. The vernal equinox, marking the beginning of spring in the Northern Hemisphere, occurs about March 21, when the Sun moves north across the celestial … Vernal equinox, two moments in the year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and the celestial equator intersect. countable noun [oft supp N] An equinox is one of the two days in the year when day and night are of equal length. Some of the statements above can be made clearer by picturing the day arc (i.e., Strictly speaking, at the equinox, the Sun's ecliptic longitude is zero. Noun. A dramatic example is Saturn, where the equinox places its Mars's most recent equinox was on 8 April 2020 (northern autumn), and the next will be on 7 February 2021 (northern spring).Astronomical event where the Sun is directly above the Earth's equatorThis article is about an astronomical event. These times are not exact for several reasons: The real equality of day and night only happens in places far enough from the equator to have a seasonal difference in day length of at least 7 minutes,The times of sunset and sunrise vary with the observer's location (A third correction for the visual observation of a sunrise (or sunset) is the angle between the apparent horizon as seen by an observer and the geometric (or sensible) horizon. Since the Moon (and to a lesser extent the planets) causes The relation between the Earth, Sun, and stars at the March equinox. 1. equinox - either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length. Middle English, from Anglo-French or Medieval Latin; Anglo-French The vernal equinox marks the beginning of spring. For the celestial coordinates, see Prior to the 1980s there was no generally accepted term for the phenomenon, and the word "equilux" was more commonly used as a synonym for "The IAU Working Group on Precession and the Ecliptic...have recommended that the ecliptic be more precisely defined as the plane perpendicular to the mean orbital angular momentum vector of the Earth-Moon barycenter passing through the Sun in the BCRS." [ ē ′kwə-nŏks′ ] Either of the two points on the celestial sphere where the ecliptic (the apparent path of the Sun) crosses the celestial equator.♦ The point at which the Sun's path crosses the celestial equator moving from south to north is called the vernal equinox. In the half-year centered on the December solstice, the Sun rises south of east and sets south of west and the durations of day and night are reversed. A number of traditional One effect of equinoctial periods is the temporary disruption of Equinoxes occur on any planet with a tilted rotational axis. Later it was realized that this happens on a day when the durations of the day and the night are practically equal and the word "equinox" comes from Latin aequus, meaning "equal", and nox, meaning "night".


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