Planets


This applet shows the position of the planets in their orbit around the sun.

If the applet does not appear, please try the following:
(1) Download the Java software from www.java.com.
(2) Go to the menu: Tools > Turn off Pop-Up Blocker.
(3) Tools > Internet Options > Advanced > Security > Allow Active Contents.
(4) Start Menu > All Programs > Java > Configure Java > Security and then add this website to the Exception Site List.


The period of rotation T of a planet is given by:
T2 = (4π2 / GM) r3

where G = universal gravitational constant = 6.6743 x 10-11 N m2 kg-2
M = mass of the Sun = 1.9889 x 1030 kg
r = radius of the orbit of the planet

This is Kepler's 3rd Law of Planetary Motion: T2 is proportional to r3

PlanetDistance from Sun r (km)Period of Revolution T (years)
Mercury57 900 00086 days
Venus108 200 000225 days
Earth149 600 0001
Mars227 392 0001.88
Jupiter778 300 00011.9
Saturn1 427 000 00029.5
Uranus2 870 000 00084.0
Neptune4 497 000 000164



Right-click here to download this page and the Java Class File.