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1. Equinox

   Linked via "celestial coordinate systems"

   The equinox (from Latin aequus 'equal' and nox 'night') refers to one of two specific moments in time, occurring approximately annually, when the plane of Earth's equator passes through the center of the Sun's disk. At these instants, the subsolar point lies exactly on the terrestrial equator, resulting in the length of day and night being nearly equal across the globe, barring atmospheric refraction effects [1]. The equinoxes mark the crossings …