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The Ptolemy Universe shows the solar system planets in five views :
1) Heliocentric : the copernicus view with the sun at the center
2) Geocentric : the ptolemy view with the earth at the center
3) Ecliptic : planets seen from earth
4) Retrograds : epicycloid of each planet. swipe for next
5) Dancing Venus and Mercury

Touch around the sun/earth and see the planets moving.
Use Start button to anime the solar system, and the slider to adjust the speed.

On Ecliptic view, a long press on stars or planets shows their name.

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