You see this fellow that is gone before;— He is a soldier fit to stand by Caesar And give direction: and do but see his vice; ’tis to his virtue a just equinox, The one as long as the other: ’tis pity of him.
There are no more uses of "equinox" in the play.
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For a few minutes on the day of the equinox, the Sun’s radiation overwhelms the receiving station for the geostationary satellite.
According to Wikipedia, it is an urban legend that one can balance an egg on its point on an equinox day, but actually one can balance an egg on its point any day of the year with enough patience.