Lunație

Variația duratei lunației între 2010 și 2018.

Lunația este intervalul de timp care separă două Luni noi și a cărei durată medie este de 29 de zile, 12 ore, 44 de minute și 2,8 secunde.[1]

Luna se rotește în jurul Pământului în ceva mai mult de 27 de zile (27 de zile, 7 ore, 43 de minute și 11,5 secunde), dar în timpul acestei revoluții, Pământul avansează cu circa 1/12 pe orbita sa în jurul Soarelui. Or, cum revoluția Pământului și a Lunii sunt în același sens, acest lucru se traduce prin faptul că pentru a reveni la aceeași fază, Luna trebuie să-și facă revoluția (27 de zile, și deci aceeași poziție relativă a Pământului) plus 2 zile. În total sunt 29 de zile și jumătae (mai precis: 29 de zile, 12 ore, 44 de minute și 2,8 secunde, și deci aceeași poziție relativă a axei Pământ-Soare).

Durata lunației indicată mai sus este una medie. Durata lunațiilor variază în realitate în cursul unui an (de ordinul a ±6 ore) și chiar de la un an la altul.[2]

Etimologie

Termenul lunație (cu varianta: lunațiune[3]) provine din limba latină medievală: lunatio, lunationis.[3][4]

Note

  1. ^ fr Dictionnaire professionnel illustré de l’horlogerie, Fédération de l'industrie horlogère Suisse FH (Définition lunaison)
  2. ^ fr Jean Meeus, La durée de la lunaison, In: Ciel et Terre, Vol. 76, p. 21, 1960
  3. ^ a b Ioan Oprea, Carmen-Gabriela Pamfil, Rodica Radu, Victoria Zăstroiu, Noul dicționar universal al limbii române
  4. ^ Florin Marcu și Constant Maneca, Dicționar de neologisme

Bibliografie

  • Ioan Oprea, Carmen-Gabriela Pamfil, Rodica Radu, Victoria Zăstroiu, Noul dicționar universal al limbii române, Ediția a doua, Editura Litera Internațional, București-Chișinău, 2007. ISBN 978-973-675-307-7
  • Florin Marcu și Constant Maneca, Dicționar de neologisme, Editura Academiei, București, 1986.

Vezi și

Wikţionar
Wikţionar
Caută „en:lunation” în Wikționar, dicționarul liber.
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