4 Sentences With "ante meridiem"

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Solar noon (informally high noon and formally local apparent solar noon) is the moment when the Sun contacts the observer's meridian, reaching its highest position above the horizon on that day ("Sun transit time") and leaving the shortest shadow. This is also the origin of the terms ante meridiem (a.m.) and post meridiem (p.m.), as noted below.
The term meridian comes from the Latin meridies, meaning "midday"; the subsolar point passes through a given meridian at solar noon, midway between the times of sunrise and sunset on that meridian. Likewise, the Sun crosses the celestial meridian at the same time. The same Latin stem gives rise to the terms a.m. (ante meridiem) and p.m.
The 12-hour clock is a time convention popularized by the Romans in which the 24 hours of the day are divided into two periods. The Romans divided the day into 12 equal hours, A.M. (ante-meridiem, meaning before midday) and P.M. (post-meridiem, meaning past midday). The Romans also started the practice used worldwide today of a new day beginning at midnight.
A Roman era sundial on display at a museum in Side, Turkey In Roman timekeeping, a day was divided into periods according to the available technology. Initially the day was divided into two parts: the ante meridiem and the post meridiem, before noon and afternoon, respectively. With the advent of the sundial circa 263 BC, the period from sunrise to sunset was divided into 12 hours.