Planetary Hours
Twenty-four unequal hours from sunrise to the next sunrise, in Chaldean order. The engine divides the real solar day at this place — JPL DE440.
Asking the engine for this solar day…
Hour of the nativity
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ASTRONOMICAL DOCTRINE & EPHEMERIS
Planetary hours divide each diurnal and nocturnal arc into twelve equal fractions of time, yielding unequal seasonal hours based on topocentric horizon crossings. Hours progress continuously in the Chaldean order: ♄ Saturn → ♃ Jupiter → ♂ Mars → ☉ Sun → ♀ Venus → ☿ Mercury → ☽ Moon. Planetary positions and solar horizon events computed with NASA JPL DE440.