March 20 "Vernal Equinox" Day and night are of equal length, 12 hours.

The definition of sunrise and sunset times for these phenomena is counted when we see the “top edge” of the sun touching the horizon. That is, when the sun rises, the time is counted when the top edge of the sun touches the eastern horizon. And when the sun sets, the time is counted when the top edge of the sun touches the western horizon (or when the sun sets completely).

credit : สล็อต เว็บตรง

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