Planetarium Main Page
Technical Background

The DOGULEAN Planetarium 2.2

Space Traveler Edition

Requirements and Recommendations

Basic Requirements

If the Planetarium Seems to be Eating Up Too Many of Your Machine's Cycles

Depending on the zoom and time rate you have set, the Planetarium may update the screen as often as 10 times per second. If that doesn't leave your machine enough cycles to do other things, then maybe you shouldn't run the Planetarium on that machine.

If you still want to run the Planetarium on that machine, try reloading the page. After that, if your machine is still too slow, don't use it to run the planetarium.

If your machine's performance is ok after reloading, then, in future, don't zoom in so much or set the clock rate so high. Your device is probably marginal for using the Planetarium.

A Note on Privacy

The Planetarium is a static web page running a large Javascript application. It does not communicate with the web server using cookies. It uses the browser's persistent storage to save your control settings between sessions.

What If I Don't Have a Mouse With Two Buttons and a Wheel?

To use the Planetarium, you need a pointing device that can imitate the following things that you can do with a standard mouse that has left and right buttons and a mouse wheel:
  1. Left-click: Click the left mouse button.
  2. Left-drag: Hold the left mouse button down and drag the mouse.
  3. Right click: Click the right mouse button.
  4. Turn the mouse wheel.
The following are descriptions of how to do this with various pointing devices I know about.

Standard Touchpad

  1. Left-click: Press down on the touchpad with on finger and release.
  2. Left-drag: Press down with one finger and either move that same finger or glide another finger over the touchpad. I find that gliding with another finger is usually easier.
  3. Right-click: Press down with two fingers.
  4. Turn the mouse wheel: Touch two fingers to the mouse pad and glide them on the pad. If the touchpad is part of a laptop, the direction to glide is toward you or away.

Mice That Don't Have Obvious Buttons

The ones I am familiar with work as follows.
  1. Left-click: Press the left side of the mouse and release.
  2. Left-drag: Press and hold the left side of the mouse and drag the mouse.
  3. Right click: Press the right side of the mouse and release.
  4. Turn the mouse wheel: Stroke the middle of the mouse.


Touchscreens are not officially supported, but the following may work on platforms other than iOS. iOS is really not supported.

Sliders don't work very well and neither do the little up and down arrows in number entry boxes, but if you don't use the control panel much anyway, you may do all right.

Tablets, etc.

The discussion of touchscreens, above, applies.