equinox
Sign in to saveA solar equinox is a moment in time when the Sun appears directly above the equator, rather than to its north or south. On the day of the equinox, the Sun appears to rise directly east and set directly west. This occurs twice each year, around 20 March and 23 September.
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An equinox is a moment when the Sun appears directly above Earth's equator, causing it to rise due east and set due west. This happens twice yearly, around March 20 and September 23, and marks a significant point in Earth's yearly cycle around the Sun.
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Article
15 sectionsContents
- Equinoxes on Earth
- General
- Date
- Modern dates
- Names
- Length of equinoctial day and night
- Unequal intervals between equinoxes
- Auroras
- Cultural aspects
- Effects on satellites
- Equinoxes on other planets
- See also
- Footnotes
- References
- External links
A solar equinox is a moment in time when the Sun appears directly above the equator, rather than to its north or south. On the day of the equinox, the Sun appears to rise directly east and set directly west. This occurs twice each year, around 20 March and 23 September.
An equinox is equivalently defined as the time when the plane of Earth's equator passes through the geometric center of the Sun's disk. This is also the moment when Earth's rotation axis is directly perpendicular to the Sun-Earth line, tilting neither toward nor away from the Sun. In modern times, since the Moon and (to a lesser extent) the planets cause Earth's orbit to vary slightly from a perfect ellipse, the equinox is officially defined by the Sun's more regular ecliptic longitude rather than by its declination. The instants of the equinoxes are currently defined to be when the apparent geocentric longitude of the Sun is 0° and 180°.