| Name |
May 01 |
May 11 |
May 21 |
| Mercury |
242o 11' |
269o 46' |
299o 05' |
| Venus |
243o 39' |
259o 32' |
275o 22' |
| Earth |
220o 49' |
230o 30' |
240o 08' |
| Mars |
083o 00' |
087o 59' |
092o 54' |
| Ceres |
069o 39' |
071o 56' |
073o 73' |
| Jupiter |
199o 59' |
200o 45' |
201o 30' |
| Saturn |
263o 08' |
263o 26' |
263o 44' |
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Plot planet positions using polar graph paper
that you can download from this web site - or at that web site create your own.
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This uses a coordinate system called heliocentric longitude where the 0o point is at
the May or Vernal Equinox coordinate of 0 hours Right Ascension. From 0o longitude an object's orbit around the Sun and its
heliocentric longitude increase at a rate determined by the orbital speed of the particular planet. The planet motion is counterclockwise
as the animation below shows. Using the coordinates provided here a planet position may be plotted using degrees ranging from (0o to
360o) of heliocentric longitude. Once plotted the orbital position of one planet could be compared with that of another planet. Or the
relative orbital speeds of an inner planet could be compared with that of an outer planet.
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