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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 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. [a]

  3. 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 ...

  4. Equinox (celestial coordinates) - Wikipedia

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

    The previous standard equinox and epoch were B1950.0, a Besselian epoch. Since the right ascension and declination of stars are constantly changing due to precession, astronomers always specify these with reference to a particular equinox. Historically used Besselian equinoxes include B1875.0, B1900.0, B1925.0 and B1950.0.

  5. Hello, Your Horoscope for the Fall Equinox Is Right Here - AOL

    www.aol.com/hello-horoscope-fall-equinox...

    The fall equinox occurs on September 22, 2022. Learn about the meaning of the fall equinox in astrology and read your horoscope by zodiac sign.

  6. When is the first day of spring? 2024 spring season, spring ...

    www.aol.com/first-day-spring-2024-spring...

    What to know about the spring equinox, end of winter and more. ... spring equinox set for next week. Gannett. Marina Johnson, Louisville Courier Journal. March 16, 2024 at 5:15 AM.

  7. When is the first day of fall? All about the 2024 autumnal ...

    www.aol.com/first-day-fall-2024-autumnal...

    In the Northern Hemisphere after the autumnal equinox, the days begin to get shorter as the winter solstice gets closer. The seasons result from the Earth's tilt toward or away from the Sun.

  8. Right ascension - Wikipedia

    en.wikipedia.org/wiki/Right_ascension

    Right ascension and declination as seen on the inside of the celestial sphere. The primary direction of the system is the March equinox, the ascending node of the ecliptic (red) on the celestial equator (blue). Right ascension is measured eastward up to 24 h along the celestial equator from the primary direction.

  9. March equinox - Wikipedia

    en.wikipedia.org/wiki/March_equinox

    The Persian calendar begins each year at the northward equinox, observationally determined at Tehran. [15] The Indian national calendar starts the year on the day next to the vernal equinox on 22 March (21 March in leap years) with a 30-day month (31 days in leap years), then has 5 months of 31 days followed by 6 months of 30 days. [15]