Description: Equinoxes on Earth General. Systematically observing the sunrise, people discovered that it occurs between two extreme locations at the horizon and eventually noted the midpoint between the two. Later it was realized that this happens on a day when the durations of the day and the night are practically equal and the word "equinox" comes from Latin aequus, meaning "equal", and nox, meaning "night".
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2. Equinox | Definition of Equinox at Dictionary.com
Description: Equinox definition, the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox, or spring equinox ) and September 22 (autumnal equinox ). See more.
Description: Earth isn’t the only planet that experiences equinoxes: Every planet in our solar system has them. In 2009, the Cassini probe in orbit around Saturn captured an equinox on the ringed planet. As ...
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4. equinox | Definition, Dates, & Facts | Britannica
Description: …the hour angle of the vernal equinox, a reference point that is one of the two intersections of the celestial equator and the ecliptic. Because of a small periodic oscillation, or wobble, of the Earth’s axis, called nutation, there is a distinction between the true and mean equinoxes. The difference…
Description: These events are referred to as Equinoxes.The word equinox is derived from two Latin words - aequus (equal) and nox (night). At the equator, the sun is directly overhead at noon on these two equinoxes. The "nearly" equal hours of day and night is due to refraction of sunlight or a bending of the light's rays that causes the sun to appear above ...
Description: But on the two equinoxes, the tilt of Earth’s axis is perpendicular to the Sun’s rays, like the illustrations show. Why Is it Called "Equinox"? On the equinox, night and day are nearly exactly the same length – 12 hours – all over the world. This is the reason it’s called an "equinox," derived from Latin, meaning "equal night."
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7. Precession of the equinoxes | astronomy | Britannica
Description: Precession of the equinoxes, motion of the equinoxes along the ecliptic (the plane of Earth’s orbit) caused by the cyclic precession of Earth’s axis of rotation. In compiling his famous star catalog (completed in 129 bce), the Greek astronomer Hipparchus noticed that the positions of the stars were
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8. Spring Equinox – Vernal Equinox, Southern & Northern
Description: Equinoxes and solstices happen twice a year. Not Entirely Equal Day & Night. On the equinoxes the Sun shines directly on the equator and the length of day and night is nearly equal – but not quite.. The March equinox marks the moment the Sun crosses the celestial equator – the imaginary line in the sky above the Earth’s equator – from south to north and vice versa in September.