Ten utwór został udostępniony jako własność publiczna przez jego autora, Tomruen. Dotyczy to całego świata. W niektórych krajach może nie być to prawnie możliwe, jeśli tak, to: Tomruen zapewnia każdemu prawo do użycia tej pracy w dowolnym celu, bez żadnych ograniczeń, chyba że te ograniczenia są wymagane przez prawo.

{original upload log}

This image is a derivative work of the following images:

• File:Lunar_libration_with_phase_Oct_2007.gif licensed with PD-self
  • 2007-11-06T01:03:49Z Tomruen 640x642 (10111965 Bytes) 'Summary == Information | Description = {en|[Moon|Lunar][en:libration..for more descriptions'

[:fr:Libration|[:fr:lune|lune]. description'

Uploaded with derivativeFX

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. [1]

• Animation
  • 60 frames, 12 hour step.
  • Period used: 29.5 days
  • Animation began and ended near 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.)

This version of the animation has less frames compared to the original to make the loop continuous (jumpiness when restarting).