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Professor-level problem: the contradiction between the direction of sunrise and sunset in the equator and the apparent motion chart!

2024-09-15 02:36
1. According to the usual saying, except for the vernal equinox and autumnal equinox, the sunrise direction was not due east. When the sun was directly in the northern hemisphere, the sun in the equator rose in the northeast and set in the northwest. When the sun shone directly on the southern hemisphere, the sun rose in the southeast and set in the southwest. However, if one were to use the sun's apparent motion diagram to analyze, in order to ensure that the equator equates day and night throughout the year, the sun must rise from the east and set from the west. Otherwise, the day would be longer or shorter than the night!
2024-09-15 06:02

The contradiction between the direction of sunrise and sunset in the equator and the apparent motion map can be solved by the following explanation: At the equator, the Earth's axis of rotation intersected with the sun's trajectory at a point, which meant that the longitude of the equator was 0 degrees. So when the sun rises in the east, it actually rises on the left side of the earth's axis of rotation, and when the sun sets in the west, it actually sets on the right side of the earth's axis of rotation. However, the sun actually rises from the east along an equator and sets from the west along an equator. Therefore, the position of sunrise and sunset in the equator is actually opposite to the direction of the motion map. This contradiction could be solved by combining the trajectory of the sun with the trajectory of the earth. As the Earth rotated, the Sun also revolved around the Earth in a spiral. Therefore, when the sun rises from the east, its trajectory on the equator is actually moving from left to right, and when the sun sets in the west, its trajectory on the equator is actually moving from right to left. Therefore, the position of sunrise and sunset in the equator is the same as the direction of the motion chart.

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