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noon
Noon (also midday or noon time) is usually defined as 12 o'clock in the daytime. The term midday is also used colloquially to refer to an arbitrary period of time in the middle of the day. Solar noon is when the sun crosses the meridian and is at its highest elevation in the sky, at 12 o'clock apparent solar time. The local or clock time of solar noon depends on the longitude and date.〔"(The Sun as an Energy Resource )"〕 The opposite of noon is midnight.
In many cultures in the Northern Hemisphere, ''noon'' had ancient geographic associations with the direction "south" (as did midnight with "north" in some cultures). Remnants of the ''noon'' = ''south'' association are preserved in the words for ''noon'' in French (''Midi'') and Italian (''Mezzogiorno''), both of which also refer to the southern parts of the respective countries. Modern Polish, Ukrainian, and Serbian go a step farther, with the words for noon (''południe'', південь, пoднeliterally "half-day") also meaning "south" and the words for "midnight" (''północ'', північ, пoнoħliterally "half-night", as with English mid(dle) meaning "half") also meaning "north".
==Etymology==
The word ''noon'' is derived from Latin ''nona hora'', the ninth hour of the day, and is related to the liturgical term none. The Roman and Western European medieval monastic day began at 6:00 a.m. (06:00) at the equinox by modern timekeeping, so the ninth hour started at what is now 3:00 p.m. (15:00) at the equinox. In English, the meaning of the word shifted to ''midday'' and the time gradually moved back to 12:00 local time (that is, not taking into account the modern invention of time zones). The change began in the 12th century and was fixed by the 14th century.〔(Online Etymology Dictionary )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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