The Seasons (tropics version) - introduction

The spring (vernal) and autumn equinoxes are the midway points between the solstices, when the Earth's axis is aligned perpendicular to the Sun's direction. Thus, night and day are of equal length on the equinoxes. Note that the equinoxes also correspond to the points on the sky where the ecliptic (the Sun's path) intersects the ................
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