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View of the Earth, with the continent of Africa at the center, as seen from a satellite. Half of the Earth is dark, so it is night, half of the Earth is light, so it is day. Video begins at the September equinox, where the terminator, the line dividing night and day, is vertical. As the video progresses, the terminal tilts to the right, so that more of the Sothern Hemisphere is light and more of the northern Hemisphere is dark. This continues until December. At this point, the terminator tilts back towards the left until it is vertical again at the March equinox. The terminator continues tilting towards the left, so that more of the Northern Hemisphere is light and more of the Southern Hemisphere is dark. This continues until June. At this point, the terminator tilts back towards the right, bringing us back to where we started with the September equinox with a vertical terminator.

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View of the Earth, with the continent of Africa at the center, as seen from a satellite. Half of the Earth is dark, so it is night, half of the Earth is light, so it is day. Video begins at the September equinox, where the terminator, the line dividing night and day, is vertical. As the video progresses, the terminal tilts to the right, so that more of the Sothern Hemisphere is light and more of the northern Hemisphere is dark. This continues until December. At this point, the terminator tilts back towards the left until it is vertical again at the March equinox. The terminator continues tilting towards the left, so that more of the Northern Hemisphere is light and more of the Southern Hemisphere is dark. This continues until June. At this point, the terminator tilts back towards the right, bringing us back to where we started with the September equinox with a vertical terminator.

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Kelly Lepo (kellylepo@astrodon.social)'s status on Saturday, 24-Dec-2022 03:16:08 JST Kelly Lepo
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Here is a time-lapse of the Earth, as seen from a geostationary satellite. Looking at the Northern Hemisphere, night is on the left and day is on the right.
This matches what we see from the ground. The northern Hemisphere gets more daylight hours for half the year and simultaneously the Southern Hemisphere gets fewer hours of daylight. This reverses after six months. On the equator, the days are always about the same length.
(4/)
Credit: NASA Goddard https://svs.gsfc.nasa.gov/11664

In conversation Saturday, 24-Dec-2022 03:16:08 JST from gnusocial.jp permalink