Solar Term Geography: Where is the direct point of the sun at the autumnal equinox?

The earth will move its position, so we can feel obvious changes all year round, and the sun has been turning. The sun has been moving westward, and among the 24 solar terms, the four seasons can be clearly distinguished with the sun's irradiation. So, at the autumnal equinox, where is the direct point of the sun? Do you know that?/You know what?

The direct point of the sun moves westward every hour, passing through longitude 15 degrees every hour. In the calculation of geography problems, we can roughly take the latitude of moving 0.25 degrees every day.

At the vernal equinox, the direct point of the sun is on the equator, and then it moves northward until it reaches the Tropic of Cancer on June 22nd (that is, the summer solstice). On the summer solstice, the direct point of the sun is on the tropic of cancer, and then it moves south until it reaches the equator on September 23 (autumnal equinox). At the autumnal equinox, the direct point of the sun is at the equator, and then it continues to move southward until it reaches the tropic of Capricorn (that is, the winter solstice) on February 22, 65438. On the solstice in winter, the direct point of the sun is on the tropic of cancer, then it moves northward and returns to the equator on March 2 1 day (that is, the vernal equinox). The cycle of this repeated regression movement is 365 days, 5: 48: 46, that is, about 365.2422 days, which is called the tropic of cancer.

According to Kepler's law, the earth revolves around the sun in an elliptical orbit, and the sun is at a focus of the ellipse, so perihelion and apohelion appear! With the sun as the center, the area swept by the earth in unit time is equal.

The northern hemisphere is apohelion after July, with long days and short nights, while the southern hemisphere is the opposite.

January is perihelion, with short days and long nights. 65438+1early October, perihelion, the distance between the sun and the earth is 1.47 1.000000 km, angular velocity is 6 1 min/antenna speed is 30.3 km/s, and early July, perihelion, the distance between the sun and the earth is/kloc.

The length of day and night is March 2 1, vernal equinox, equal length of day and night, June 22, summer solstice, long day and short night (northern hemisphere), September 23, autumn equinox, equal length of day and night (northern hemisphere), equal length of day and night, equal length of winter solstice, equal length of day and night.

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