- Planet simulation ver1.7 -

Left-click　: Add a planet. Change menu.
Right-click : Change menu.

[Color]　　 : Change the color of a planet.
　　　　　　　"?" shows a random color.
[Track]　　 : Change the type of trajectory.
　　　　　　　line　　　- short line
　　　　　　　long line - long line
　　　　　　　point　　 - dotted line
　　　　　　　non　　　 - hide
[Target]　　: Add a planet to the selected direction.
　　　　　　　1. Click the mouse to locate a planet.
　　　　　　　2. Drag the mouse to determine the direction.
　　　　　　　3. Release the mouse.
[Random]　　: Add a planet to a random direction.
　　　　　　　Click again to change the speed of the planet.
[Circle]　　: Add a planet with a circular orbit.
[Size]　　　: Change the size of a planet.
[Star]　　　: Add and delete stars.
　　　　　　　By clicking the blank space you'll add the stars.
　　　　　　　By clicking on the stars, you'll delete them.
[Scale]　　 : Change the scale of the screen.
[Speed]　　 : Change the flow of the time.
　　　　　　　From 8 to 1/4 times speed. 0 stops the time.
[Reset]　　 : Reset.