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  2. Equinox - Wikipedia

    en.wikipedia.org/wiki/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 ...

  3. March equinox - Wikipedia

    en.wikipedia.org/wiki/March_equinox

    The March equinox is known as the vernal equinox (or spring equinox) in the Northern Hemisphere and as the autumnal equinox (or fall equinox) in the Southern Hemisphere. [8] [7] [10] On the Gregorian calendar at 0° longitude, the northward equinox can occur as early as 19 March (which happened most recently in 1796, and will happen next in ...

  4. 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 ...

  5. Equinox Group - Wikipedia

    en.wikipedia.org/wiki/Equinox_Group

    Equinox Holdings, Inc. is an American luxury fitness company and health club headquartered in New York City, New York. The company operates more than 300 club facilities in major cities in the United States , as well as in London , Toronto , and Vancouver in Canada .

  6. Spring equinox - Wikipedia

    en.wikipedia.org/wiki/Spring_equinox

    Spring equinox or vernal equinox or variations may refer to: March equinox, the spring equinox in the Northern Hemisphere;

  7. Equinox (celestial coordinates) - Wikipedia

    en.wikipedia.org/wiki/Equinox_(celestial...

    In astronomy, an equinox is either of two places on the celestial sphere at which the ecliptic intersects the celestial equator. [1] [2] [3] Although there are two such intersections, the equinox associated with the Sun's ascending node is used as the conventional origin of celestial coordinate systems and referred to simply as "the equinox".

  8. Solstice - Wikipedia

    en.wikipedia.org/wiki/Solstice

    Unlike the equinox, the solstice time is not easy to determine. The changes in solar declination become smaller as the Sun gets closer to its maximum/minimum declination. The days before and after the solstice, the declination speed is less than 30 arcseconds per day which is less than 1 ⁄ 60 of the angular size of the Sun, or the equivalent ...

  9. Earth-centered inertial - Wikipedia

    en.wikipedia.org/wiki/Earth-centered_inertial

    An equinox occurs when the earth is at a position in its orbit such that a vector from the earth toward the sun points to where the ecliptic intersects the celestial equator. The equinox which occurs near the first day of spring (with respect to the North hemisphere) is called the vernal equinox.