Traditional Culture Encyclopedia - The 24 Solar Terms - Is the sunrise in winter in the southeast and the summer in the northeast?
Is the sunrise in winter in the southeast and the summer in the northeast?
At different latitudes, the "tilt" degree of the sun's trajectory is different. The two points where the celestial equator intersects the horizon are due east and due west. It can be seen that the sun rises in the northeast and sets in the northwest during the summer solstice.
At noon on the summer solstice, that is, when the local time is noon, the sun in the south of the Tropic of Cancer is at the zenith to the north, and the sun in the north of the Tropic of Cancer is at the zenith to the south.
At the vernal equinox and autumnal equinox, the sun's "trajectory" coincides with the celestial equator. In other words, only the sun at the vernal equinox and autumnal equinox rises in the east and sets in the west in a year.
It can be seen that during most of the year, the sun north of the Tropic of Cancer is in the south direction, which is the situation mentioned at the beginning of this article. But this does not mean that the sun north of the Tropic of Cancer will not appear in the northerly direction of the sky.
Extended data
We can also understand why the northern hemisphere has long days and short nights in summer and long nights in winter. It can be seen that during the summer solstice, the trajectory of the sun on the horizon is an optimal arc (arc with a central angle greater than180).
During the winter solstice, the trajectory of the sun on the horizon is a bad arc (the arc with the central angle less than180). On the vernal equinox, the sun's trajectory above the horizon is a semicircle.
It is approximately believed that the sun runs at a uniform speed along the "trajectory". So in summer, there is more time to run the arc during the day, and less time to run the arc in winter. On the vernal equinox, the trajectory of the sun is "equally divided", so the length of day and night is the same.
Reference source; Baidu encyclopedia-sunrise time
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