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  2. Equinox - Wikipedia

    en.wikipedia.org/wiki/Equinox

    Equinox. 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 south of the equator. On the day of the equinox, the Sun appears to rise "due east" and set "due west". This occurs twice each year, around 20 March and 23 September.

  3. Autumnal equinox - Wikipedia

    en.wikipedia.org/wiki/Autumnal_equinox

    Autumnal Equinox Day (Japanese: 秋分の日, Shūbun no Hi ), a public holiday in September in Japan. Autumn Equinox: Amethyst Deceivers, a 1998 record by Coil. "An Autumnal Equinox", a song from The Caretaker's 2016 album Everywhere at the End of Time - Stage 1.

  4. March equinox - Wikipedia

    en.wikipedia.org/wiki/March_equinox

    The March equinox [7] [8] or northward equinox [9] is the equinox on the Earth when the subsolar point appears to leave the Southern Hemisphere and cross the celestial equator, heading northward as seen from Earth. The March equinox is known as the vernal equinox (spring equinox) in the Northern Hemisphere and as the autumnal equinox (autumn ...

  5. Autumn - Wikipedia

    en.wikipedia.org/wiki/Autumn

    Autumn is the season when the duration of daylight becomes noticeably shorter and the temperature cools considerably. Day length decreases and night length increases as the season progresses until the winter solstice in December (Northern Hemisphere) and June (Southern Hemisphere).

  6. September equinox - Wikipedia

    en.wikipedia.org/wiki/September_equinox

    The September equinox (or southward equinox) is the moment when the Sun appears to cross the celestial equator, heading southward. Because of differences between the calendar year and the tropical year, the September equinox may occur from September 21 to 24. At the equinox, the Sun as viewed from the equator rises due east and sets due west.

  7. Autumnal Equinox Day - Wikipedia

    en.wikipedia.org/wiki/Autumnal_Equinox_Day

    Frequency. annual. Autumnal Equinox Day (秋分の日, Shūbun no Hi) is a public holiday in Japan that usually occurs on September 22 or 23, the date of Southward equinox in Japan Standard Time (autumnal equinox can occur on different dates for different time zones). Due to the necessity of recent astronomical measurements, the date of the ...

  8. Solstice - Wikipedia

    en.wikipedia.org/wiki/Solstice

    A solstice is the time when the Sun reaches its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, around June 20–22 and December 20–22. In many countries, the seasons of the year are determined by the solstices and the equinoxes . The term solstice can also be used ...

  9. First point of Aries - Wikipedia

    en.wikipedia.org/wiki/First_point_of_Aries

    The first point of Aries defines the ecliptic coordinate of (0°, 0°). It is on the celestial equator at both the left and right extremes of the sky chart, with the ecliptic (the orange dotted sine curve) passing through it. The first point of Aries, also known as the cusp of Aries, is the location of the March equinox (the vernal equinox in ...