Equinox - Wikipedia
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]
Equinox | Definition, Dates, & Facts | Britannica
Equinox, either of the two moments in the year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and the celestial equator intersect.
What Is the Equinox? And What Is the Solstice? - timeanddate.com
What Is the Equinox? And What Is the Solstice? By Graham Jones. Equinoxes and solstices are a result of two things: Earth’s tilt and its orbit around the Sun.
March equinox 2025: All you need to know - EarthSky
The March equinox – aka the vernal equinox – marks the sun’s crossing above Earth’s equator, moving from south to north. Earth’s tilt on its axis is what causes this northward shift of ...
2025 September equinox: All you need to know - EarthSky
The September equinox is a seasonal milestone in Earth’s yearly orbit around the sun. At an equinox, the sun appears directly above Earth’s equator.
Equinox (celestial coordinates) - Wikipedia
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
What is an equinox? | Space
2024年3月19日 · Twice a year, day and night are about the same length in both the Southern and Northern Hemispheres. This phenomenon is called an equinox, which comes from the Latin words "aequus" (equal) and...
Equinox – Definition, Facts, Dates - Science Notes and Projects
2024年9月4日 · The equinox marks a significant astronomical event that occurs twice a year, signaling a moment of balance between day and night across the globe. It is when Earth’s tilt perfectly aligns with its orbit around the Sun, creating nearly equal lengths of day and night.
Equinox (astronomy) - Definition & Detailed Explanation
2024年3月21日 · What is an Equinox in Astronomy? An equinox in astronomy refers to the two points in the year when the sun crosses the celestial equator, resulting in day and night being of approximately equal length all over the world.
Equinox - New World Encyclopedia
An equinox in astronomy is the moment in time (not a whole day) when the center of the Sun can be observed to be directly above the Earth's equator, occurring around March 20 and September 23 each year.
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