Mezzogiorno (parte del giorno)

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Dipinto di un paesaggio nell'ora meridiana

Il mezzogiorno (anche mezzodì) è la dodicesima ora della giornata nel fuso orario di riferimento, e separa il mattino dal pomeriggio. L'orario opposto è la mezzanotte. Per meriggio, che ha quasi lo stesso significato, si intende la parte del giorno intorno al mezzogiorno, quindi con un significato più ampio del concetto[1].

Caratteristiche

Nel sistema di numerazione delle ore britannico, basato su due cicli di 12 ore, corrisponde alle 12:00 P.M. (post meridiem, pomeridiane). Da un punto di vista astronomico, fatte salve le variazioni introdotte dall'ora standard, dall'ora legale e dall'equazione del tempo, il mezzogiorno corrisponde al momento del giorno in cui il sole appare più vicino allo zenit (mezzogiorno solare o vero, detto anche astronomico) ed è, quindi, l'ora in cui il sole raggiunge la massima altezza ad un dato giorno e latitudine, transitando per il meridiano locale (culminazione superiore). Il mezzogiorno astronomico non coincide con il mezzogiorno civile, ovvero orario: varia nel corso dell'anno.[2][3]

Nella fascia tropicale, compresa tra i due tropici, il sole si trova allo zenit due volte all'anno. In corrispondenza del Tropico del Cancro è allo zenit il giorno del Solstizio d'estate, mentre in corrispondenza del Tropico del Capricorno è allo zenit il giorno del Solstizio d'inverno.

Note

  1. ^ Merìggio, in Treccani.it – Vocabolario Treccani on line, Roma, Istituto dell'Enciclopedia Italiana. URL consultato l'11 maggio 2019.
  2. ^ Mezzogiorno vero – Rete di Eratostene, su eratostene.vialattea.net. URL consultato il 12 marzo 2024.
  3. ^ Determinazione del mezzogiorno vero – Rete di Eratostene, su eratostene.vialattea.net. URL consultato il 12 marzo 2024.

Voci correlate

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