planet watch
above the solar system
Volume 23 -- Issue 9
Above the Solar System -- September 2017

Name September 08 September 18 September 28
Mercury 031o 50' 093o 11' 150o 12'
Venus 090o 39' 106o 50' 123o 04'
Earth 345o 32' 355o 16' 005o 04'
Mars 143o 17' 147o 40' 152o 02'
Ceres 096o 06' 098o 30' 100o 59'
Jupiter 209o 49' 210o 35' 211o 20'
Saturn 267o 03' 267o 21' 267o 39'
Plot planet positions using polar graph paper that you can download from this web site - or at that web site create your own.
This uses a coordinate system called heliocentric longitude where the 0o point is at the June 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.
Terrestrial Planets and Dwarf Planet Ceres in Motion at 5 day intervals.
Above the Terrestrial Planets - September 2017

Click here to see an animated graphic showing the
Terrestrial Planets orbiting the Sun during 2017.

Explore our Solar System with this really cool tool. Click here to go to the Solar System Scope web site.