Image:Lunar libration with phase2.gif

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Picture of the day This image was selected as a picture of the day for August 9, 2006. It was captioned as followed:
English: Lunar libration
العربية: الهلال لحظة تكوينه
Cymraeg: Gweddau'r Lleuad.
Deutsch: Der Mond in seinen unterschiedlichen Phasen.
English: Lunar libration
Español: Fases y libración de la Luna.
Français : Les différentes phases de la Lune
Gaeilge: Guagadh na Gealaí.
Galego: Fases da lúa e oscilación lunar
Magyar: A Hold librációja (ciklikus imbolygása)
Italiano: Le librazioni e le fasi lunari.
日本語: 月の秤動
‪Norsk (bokmål)‬: Månens faser.
‪Norsk (nynorsk)‬: Månefasane
Polski: Animacja ukazująca Księżyc we wszystkich fazach.
Português: Animação representando as fases da lua
Русский: Либрация Луны
Slovenčina: Librácia Mesiaca
Svenska: Månens librationer
Türkçe: Ayın evreleri
‪中文(简体)‬: 月相变化
Bân-lâm-gú: Ge̍h-niû tī-leh piàn-hòa ê kè-thêng tang-tiong, lán lâng só· koan-chhek tio̍h ê thian-bûn hiān-siōng.

Contents

[edit] Summary

Description
English: Lunar libration. see below for more descriptions
Français : Librations de la lune. Voir une description détaillée en dessous.
Source

English Wikipedia, original upload 7 September 2005 by Tomruen [1]
Date

2005-09-16 (published on Commons)
Author

Tomruen
Permission
(Reusing this image)

see below
Other versions Image:Lunation animation April 2007.gif (April 2007 animation, 60 frames, no phase shown)

[edit] Licensing

Public domain I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide.

In case this is not legally possible:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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[edit] Technical

  • Book: "Astronomical Formulae for Calculators, 4th edition", Jean Meeus, 1988, published by "Willmann-Bell, Inc"
    • Chapter 30 "Position of the Moon"

Source bitmap for projection from NRL's Clementine Spacecraft:

  • Animation
    • 50 frames were created, equally spaced in time.
    • Period used: 27.21222 days (Draconic month of nodes)
    • Animation began and ended at Apogee to minimize "jumping" when cycles back to the start.
    • New moon given an unreal 1% intensity "Ambient light" to show motion in all phases.
    • View assumed from the center of the earth. (Geometrically impossible, but best demonstration of monthly libration caused by moon's motion versus the shorter daily libration that would be included from the surface of the earth.)

[edit] Astronomical events

  • Sept 1, 2:23 UT - Apogee - Moon farthest from earth's center [Cancer]
  • Sept 3, 1:48 UT - New Moon [Leo]
  • Sept 6, 10:53 UT - Descending Node - On ecliptic circle, heading north to south. [Virgo]
  • Sept 11, 11:40 UT - First Quarter - Rises around noon, and at zenith near sunset [Scorpio]
  • Sept 13, 6:21 UT - Southern Limit - At farthest ecliptic south of the moon's orbit. [Sagittarius]
    • Also near farthest south declination as well.
  • Sept 16, 13:54 UT - Perigee - Closest point on orbit to earth's center. [Aquarius]
  • Sept 18, 2:04 UT - Full Moon - A "large and southern" moon up all night! [Pisces]
  • Sept 18, 8:11 UT - Ascending Node - On ecliptic, heading south to north. [Pisces]
  • Sept 25, 6:44 UT - Third Quarter - Rises after midnight, near zenith around sunrise. [Gemini]
  • Sep 26, 5:17 UT - Northern Limit - At farthest ecliptic north point of the moon's orbit. [Gemini]
    • Also near farthest north declination as well.
  • Sep 28, 15:31 UT - Apogee - Farthest point on orbit from earth's center. [Cancer]

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Date et heureDimensionsUtilisateurCommentaire
actuel16 septembre 2005 à 15:38356×334 (932 Kio)Saperaud (== Technical == * Book: "Astronomical Formulae for Calculators, 4th edition", Jean Meeus, 1988, published by "Willmann-Bell, Inc" ** Chapter 30 "Position of the Moon" Source bitmap for projection from Nasa's Clementine Spacecraft: * [http://astrogeology.u)