Planetary day
The planetary day, the classical ruler of a day of the week. Each of the seven weekdays belongs to one of the seven visible planets — Sunday the Sun, Monday the Moon, Tuesday Mars, Wednesday Mercury, Thursday Jupiter, Friday Venus, Saturday Saturn — a scheme older than the zodiac, and still visible in the day-names (French Mardi is Mars’s day, Vendredi is Venus’s). The planetary day begins at SUNRISE rather than midnight, so someone born before dawn belongs to the previous day’s planet. The order of the week is not arbitrary: it falls out of the planetary hours, taken every twenty-fourth step.
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