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File:Earth-moon-field.svg

Original file ‎(SVG file, nominally 640 × 420 pixels, file size: 125 KB)

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Summary

Description
English: Gravitational field of earth and moon (not true to scale). Vector field (blue) and its associated scalar potential field (red). Point P between earth and moon is the force free spot.
Date
Source Own work, using Media Earth Clipart and
Author MikeRun

Equipotentials (red contours) were rendered with Mathematica on a Raspberry Pi with the command 

ContourPlot[
  -1/Sqrt[(x - 2.5)*(x - 2.5) + y*y] - 0.1/Sqrt[(x + 2.5)*(x + 2.5) + y*y], 
  {x, -5, 8}, 
  {y, -7, 7}, 
  PlotRange -> {0, -2}, 
  Contours -> Table[-0.346491 + (3*0.1) - i, {i, 0, 2, 0.1}], 
  ContourShading -> None, PlotPoints -> 200
]

and then exported as SVG. Field lines were added in Inkscape.

Licensing

I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

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inception

3 November 2018

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Date/TimeThumbnailDimensionsUserComment
current11:31, 3 November 2018Thumbnail for version as of 11:31, 3 November 2018640 × 420 (125 KB)MikeRunUser created page with UploadWizard

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