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Equinox: the word promises twelve hours of day, twelve hours of night

In Paris, at the equinox, daylight runs a few minutes past twelve hours

The Sun's edge, not its centre, sets sunrise

Published times mark sunrise when the first edge appears, sunset when the last one vanishes

At sunrise, the centre is still below the horizon; at sunset, it has already slipped beneath

Near the horizon, the atmosphere lifts the Sun's image

At sunset, when the disc still seems to touch the horizon, it is already entirely below

The real balance arrives a few days after the equinox

Your position on the globe sets the date of that balance

At the equator, it never comes: daylight there always stays a little above twelve hours