A cardinal sign is a zodiac sign whose beginning occurs at the moment of seasonal change. The sun passes into Aries at the moment of the Vernal Equinox, it passes into Cancer at the moment of the Summer Solstice, the sun enters Libra at the moment of the Autumnal Equinox and the sun enters Capricorn at the moment of the Winter Solstice.
The word "cardinal" comes from the Latin word for "hinge", noting that these signs mark turning points in the year.
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