At the equinox -- or about those dates -- the sun rises and sets, which it only does once annually at both poles.
For example, at the South Pole, the sun rises about September 21 and sets about March 21.
In the northern hemisphere, the autumnal equinox marks the first day of fall. An equinox happens twice a year, when the sun shines directly on the equator and the length of day and night is nearly equal.
Correct. The March equinox, which is typically March 21 but can vary by a day either way, is the spring equinox in the northern hemisphere, because the Sun us rising into the northern hemisphere. At that very same moment, it is the autumnal equinox in the southern hemisphere, because as the Sun is moving INTO the northern hemisphere, it is moving away from the southern hemisphere. The September 21 equinox sees the Sun moving south of the equator, so the spring equinox in the south, while it is the autumnal equinox in the North.
No city, but that happens at the north and south poles.
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South America
You're describing an Equinox -- either March 21 or September 21.
Sun appears to be at eye-level and go round parallel to the horizon returning to first point of observation
At the equinox (either one of them) the Sun is directly above the equator, neither north nor south.
Exactly straight over the equator. It's a tiny bit north of the equator just before the Autumnal Equinox, and a tiny bit south of the equator just after it. In other words, the sun is 'moving' south. At the Vernal Equinox, it's also precisely over the equator, but 'moving' north.
The North Pole is dark for six months- from the September Equinox (September 21) to the March Equinox (March 21).
The circle of illumination passes through both the north and south poles only twice each year, on the spring and autumn equinox. The spring equinox occurs around March 20 and the autumn equinox occurs around September 22.
During an equinox, neither the North nor the South end of Earth's axis is tilted away from the Sun. This is because during an equinox, the tilt of Earth's axis is perpendicular to the Sun's rays, causing equal illumination of both the Northern and Southern Hemispheres.
March and September Equinoxes: the Equator (zero latitude)June Solstice: Tropic of Cancer, 23.5 degrees north latitudeDecember Solstice: Tropic of Capricorn, 23.5 degrees south latitude
In the northern hemisphere, the autumnal equinox marks the first day of fall. An equinox happens twice a year, when the sun shines directly on the equator and the length of day and night is nearly equal.
Correct. The March equinox, which is typically March 21 but can vary by a day either way, is the spring equinox in the northern hemisphere, because the Sun us rising into the northern hemisphere. At that very same moment, it is the autumnal equinox in the southern hemisphere, because as the Sun is moving INTO the northern hemisphere, it is moving away from the southern hemisphere. The September 21 equinox sees the Sun moving south of the equator, so the spring equinox in the south, while it is the autumnal equinox in the North.
The places where the ecliptic crosses the equator are called the vernal equinox (where the Sun crosses from south to north) and the autumnal equinox (where the Sun crosses from north to south). These are the points where day and night are equal in length, marking the beginning of spring and autumn, respectively.
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