<P> Midnight is the transition time from one day to the next--the moment when the date changes . In ancient Roman timekeeping, midnight was halfway between sunset and sunrise (i.e., solar midnight), varying according to the seasons . By clock time, midnight is the opposite of noon, differing from it by 12 hours . </P> <P> Solar midnight is the time opposite to solar noon, when the Sun is closest to the nadir, and the night is equidistant from dusk and dawn . Due to the advent of time zones, which regularize time across a range of meridians, and daylight saving time, it rarely coincides with 12 midnight on the clock . Solar midnight depends on longitude and time of the year rather than on time zone . </P>

When did midnight become the start of the day
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