What are spring and fall equinoxes
The equinox.
No. The sun is directly over the equator once near March 21 and again near September 21.
During an equinox, the sun is directly over the equator of the Earth. This causes the length of day and night to be nearly equal all over the world.
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Equinox
Yes.
Equator.
The statement is accurate as the sun is not directly over the equator of any of the planets except for Uranus. Uranus is unique in its rotation as it is tilted on its side, so at certain points in its orbit, the sun is nearly directly over its equator.
When Mark and Sheila cross over the equator, the different hemisphere would be the effect.