- Wikipedia: Equinox
Overview of the equinox in astronomy, the moment when the Sun passes over the equator.
en.wikipedia.org/wiki/Equinox
- Equinox, The
Brief explanation of the sun in the sky during the Spring and Fall equinox.
solar.physics.montana.edu/YPOP/Classroom/Lessons/Sundials/equinox.html
- Equinox
Explanation of the vernal and autumnal equinoxes from Eric Weisstein's World of Astronomy.
scienceworld.wolfram.com/astronomy/Equinox.html
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