Image:Lunar libration with phase2.gif

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This file was a finalist on Picture of the Year 2006.
This is a featured picture on Wikimedia Commons: it is considered one of our finest images.
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If you have an image of similar quality that can be published under a suitable copyright license, be sure to upload it, tag it, and nominate it.

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.

1 Summary
2 Licensing
3 Technical
4 Astronomical events

[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

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.

[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:

USGS: Global simple cylindrical projection at 10 km/pixel.

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]

File history

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	Date/Time	Dimensions	User	Comment
current	13:38, 16 September 2005	356×334 (932 KB)	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)

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Image:Lunar libration with phase2.gif

From Wikipedia, the free encyclopedia

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