<P> 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, Belarusian, Ukrainian, and Serbian go a step farther, with the words for noon (południe, поўдзень, південь, пoднe--literally "half - day") also meaning "south" and the words for "midnight" (północ, поўнач, північ, пoнoħ--literally "half - night", as with English mid (dle) meaning "half") also meaning "north". </P> <P> 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 . </P> <P> Solar noon (informally high 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"). This is also the origin of the terms ante meridiem (a.m.) and post meridiem (p.m.), as noted below . The Sun is directly overhead at solar noon at the Equator on the equinoxes, at the Tropic of Cancer (latitude 23 ° 26 ′ 13.0" N) on the June solstice and at the Tropic of Capricorn (23 ° 26 ′ 13.0" S) on the December solstice . In the Northern Hemisphere, north of the Tropic of Cancer, the Sun is due south of the observer at solar noon; in the Southern Hemisphere, south of the Tropic of Capricorn, it is due north . </P> <P> The elapsed time from the local solar noon of one day to the next is exactly 24 hours on only four instances in any given year . This occurs when the effects of Earth's obliquity of ecliptic and its orbital speed around the Sun offset each other . These four days for the current epoch are centered on 11 February, 13 May, 25 July, and 3 November . </P>

Where did the term high noon come from
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