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Long before conceiving this equality, primitive equatorial cultures noted the day when the Sun rises due east and sets due west , and indeed this happens on the day closest to the astronomically defined event. In the Northern Hemisphere , the March equinox is called the vernal or spring equinox while the September equinox is called the autumnal or fall equinox. In the Southern Hemisphere , the reverse is true. The dates slightly vary due to leap years and other factors. Since the Moon and to a lesser extent the planets causes Earth's orbit to slightly vary from a perfect ellipse , the equinox is officially defined by the Sun's more regular ecliptic longitude rather than by its declination.

Systematically observing the sunrise , people discovered that it occurs between two extreme locations at the horizon and eventually noted the midpoint between the two. 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". In the northern hemisphere, the vernal equinox March conventionally marks the beginning of spring in most cultures and is considered the start of the New Year in the Assyrian calendar , Hindu and the Persian calendar or Iranian calendars as Nowruz means new day , while the autumnal equinox September marks the beginning of autumn.

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Illumination of Earth by the Sun at the equinox. The relation between the Earth, Sun, and stars at the March equinox. From Earth's perspective, the Sun appears to move along the ecliptic red , which is tilted compared to the celestial equator white. Diagram of the Earth's seasons as seen from the north. Far right: December solstice. The equinoxes are the only times when the solar terminator the "edge" between night and day is perpendicular to the equator. As a result, the northern and southern hemispheres are equally illuminated. For the same reason, this is also the time when the Sun rises for an observer at one of Earth's rotational poles and sets at the other; for a brief period, both North and South Poles are in daylight.

This is possible because atmospheric refraction "lofts" the Sun's apparent disk above its true position in the sky. In other words, the equinoxes are the only times when the subsolar point is on the equator, meaning that the Sun is exactly overhead at a point on the equatorial line. The subsolar point crosses the equator moving northward at the March equinox and southward at the September equinox.

When Julius Caesar established the Julian calendar in 45 BC, he set 25 March as the date of the spring equinox; this was already the starting day of the year in the Persian and Indian calendars. Because the Julian year is longer than the tropical year by about The Pope wanted to continue to conform with the edicts of the Council of Nicaea in AD concerning the date of Easter , which means he wanted to move the vernal equinox to the date on which it fell at that time 21 March is the day allocated to it in the Easter table of the Julian calendar , and to maintain it at around that date in the future, which he achieved by reducing the number of leap years from to 97 every years.

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This in turn raised the possibility that it could fall on 22 March, and thus Easter Day might theoretically commence before the equinox. The astronomers chose the appropriate number of days to omit so that the equinox would swing from 19 to 21 March but never fall on 22 March within Europe. The dates of the equinoxes change progressively during the leap-year cycle, because the Gregorian calendar year is not commensurate with the period of the Earth's revolution about the Sun.

It is only after a complete Gregorian leap-year cycle of years that the seasons commence at approximately the same time. In the 21st century the earliest March equinox will be 19 March , while the latest was 21 March The earliest September equinox will be 21 September while the latest was 23 September Universal Time.

Day is usually defined as the period when sunlight reaches the ground in the absence of local obstacles. Sunrise and sunset can be defined in several ways, but a widespread definition is the time that the top limb of the Sun is level with the horizon.

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The apparent radius varies slightly depending on time of year, slightly larger at perihelion in January than aphelion in July , but the difference is comparatively small. Their combination means that when the upper limb of the Sun is on the visible horizon, its centre is 50 arcminutes below the geometric horizon, which is the intersection with the celestial sphere of a horizontal plane through the eye of the observer.

These effects make the day about 14 minutes longer than the night at the equator and longer still towards the poles. 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, [19] actually occurring a few days towards the winter side of each equinox. The times of sunset and sunrise vary with the observer's location longitude and latitude , so the dates when day and night are equal also depend upon 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.

This is known as the dip of the horizon and varies from 3 arcminutes for a viewer standing on the sea shore to arcminutes for a mountaineer on Everest. The date on which the day and night are exactly the same is known as an equilux ; the neologism , believed to have been coined in the s, achieved more widespread recognition in the 21st century. Prior to this, the word "equilux" was more commonly used as a synonym for isophot , and there was no generally accepted term for the phenomenon.

In the mid-latitudes, daylight increases or decreases by about three minutes per day at the equinoxes, and thus adjacent days and nights only reach within one minute of each other. The date of the closest approximation of the equilux varies slightly by latitude; in the mid-latitudes, it occurs a few days before the spring equinox and after the fall equinox in each respective hemisphere. In the half-year centered on the June solstice, the Sun rises north of east and sets north of west, which means longer days with shorter nights for the northern hemisphere and shorter days with longer nights for the southern hemisphere.

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  7. 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. Also on the day of an equinox, the Sun rises everywhere on Earth except at the poles at about and sets at about local solar time.

    These times are not exact for several reasons:. Some of the statements above can be made clearer by picturing the day arc i. The pictures show this for every hour on equinox day. The depictions presented below can be used for both the northern and the southern hemispheres. The observer is understood to be sitting near the tree on the island depicted in the middle of the ocean; the green arrows give cardinal directions.

    Twilight still lasts about one hour. Twilight lasts for more than four hours. The March equinox occurs about when the Sun appears to cross the celestial equator northward. In the Northern Hemisphere, the term vernal point is used for the time of this occurrence and for the precise direction in space where the Sun exists at that time.

    This point is the origin of some celestial coordinate systems , which are usually rooted to an astronomical epoch since it gradually varies precesses over time:. Strictly speaking, at the equinox, the Sun's ecliptic longitude is zero. Its latitude will not be exactly zero, since Earth is not exactly in the plane of the ecliptic. Its declination will not be exactly zero either.

    The mean ecliptic is defined by the barycenter of Earth and the Moon combined, so the Earth wanders slightly above and below the ecliptic due to the orbital tilt of the Moon. Because of the precession of the Earth's axis , the position of the vernal point on the celestial sphere changes over time, and the equatorial and the ecliptic coordinate systems change accordingly.

    Thus when specifying celestial coordinates for an object, one has to specify at what time the vernal point and the celestial equator are taken. That reference time is called the equinox of date.

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    The upper culmination of the vernal point is considered the start of the sidereal day for the observer. The hour angle of the vernal point is, by definition, the observer's sidereal time. The equinoxes are sometimes regarded as the start of spring and autumn. A number of traditional harvest festivals are celebrated on the date of the equinoxes.

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    One effect of equinoctial periods is the temporary disruption of communications satellites. For all geostationary satellites, there are a few days around the equinox when the Sun goes directly behind the satellite relative to Earth i. The Sun's immense power and broad radiation spectrum overload the Earth station's reception circuits with noise and, depending on antenna size and other factors, temporarily disrupt or degrade the circuit.

    The duration of those effects varies but can range from a few minutes to an hour. For a given frequency band, a larger antenna has a narrower beam-width and hence experiences shorter duration "Sun outage" windows. Satellites in geostationary orbit also experience difficulties maintaining power during the equinox, due to the fact that they now have to travel through Earth's shadow and rely only on battery power.

    Usually, a satellite will travel either north or south of the Earth's shadow due to its shifted axis throughout the year. During the equinox, since geostationary satellites are situated above the Equator, they will be put into Earth's shadow for the longest duration all year. Equinoxes occur on any planet with a tilted rotational axis.

    A dramatic example is Saturn, where the equinox places its ring system edge-on facing the Sun. As a result, they are visible only as a thin line when seen from Earth.