Image:Earth-Moon.png

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[edit] Summary

Line below Earth represents distance of Earth's centre from the system barycentre. Line below the Moon represents perigee and apogee with the moon at the semi‐major axis position. Moon shown with correct side facing earth, but without any pretty shading.

The below information refers to the original version of this file, which was twice the size of the current version (i.e. it's now 14.25 km/px). Sorry but Photoshop wasn't saving them very well, so I had to switch to GraphicConverter, which is limited to 16,000 pixels across.

Earth-Moon system at a scale of 7.1224 km/px (0.140402 px/km)

  • Earth polar diameter = 12,713.5 km (893px) ⇒ 7.1224 km/px
  • Moon equatorial diameter = 3,476.2 km (244px)
  • Lunar apogee = 405696 km (28480px)
  • Lunar semi‐major axis = 384400 km (26985px)
  • Lunar perigee = 363104 km (25490px)
  • System barycenter = 4700 km (330px)

Scale chosen because Photoshop only supports images 30,000 pixel in width, and scaling the Earth by 50% just about fits with this, all other measurements derived from there.


[edit] Licensing

Creative Commons License
Creative Commons Attribution icon		 This file is licensed under Creative Commons Attribution 2.5 License
In short: you are free to distribute and modify the file as long as you attribute its author(s) or licensor(s).

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeDimensionsUserComment
current01:57, 2 February 200614,476×480 (396 KB)Nickshanks (Halved all dimensions so I could open/re‐save in GraphicConverter and run pngcrush.)
01:43, 2 February 200628,952×960 (1.46 MB)Nickshanks (Re‐saved without interlacing. Size smaller and hopefully Wikipedia will be able to rescale without artifacts.)
01:31, 2 February 200628,952×960 (1.94 MB)Nickshanks (Earth-Moon system at a scale of 7.1224 km/px (0.140402 px/km) * Earth polar diameter = 12,713.5 km (893px) ⇒ 7.1224 km/px * Moon equatorial diameter = 3,476.2 km (244px) * Lunar apogee = 405696 km (28480px) * Lunar semi‐major axis = 384400 km (269)