Traditional Culture Encyclopedia - The 24 Solar Terms - Why is there no shadow on the vernal equinox of the sundial?
Why is there no shadow on the vernal equinox of the sundial?
Why is there no shadow on the vernal equinox of the sundial? Because: beginning of autumn, beginning of spring, at this time, the sun's trajectory is parallel to the equatorial dial. There is no shadow on the sundial except the side, so you can't mark the time. In other words, if one day is sunny, the sundial can't mark the time. This day is beginning of spring or beginning of autumn.
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