File:Earth-moon-field.svg
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  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
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