An exploration of the Foucault pendulum to discover what drives its motion. First observe a 3-D Foucault pendulum like the one at your local science museum, university, or planetarium. The pendulum will move around the floor correctly for your latitude, knocking over pegs as the earth rotates beneath it.

Leave earth and go to an asteroid that also has a pendulum. Here you can see how the pendulum's motion is linked to the distant stars. Change the pendulum's latitude and rotation rate, and view the asteroid from different angles. Switch the frame of reference between the asteroid and the universe.

Learn about the Coriolis Effect by observing balls orbiting asteroids in different frames of reference.

Tap the map to see the locations of the world's Foucault pendulums. Tap a pin on the map to get driving or walking directions to a pendulum.

The latitude is displayed. If location services are on, your actual longitude and altitude are also displayed.

What’s New

Version 1.3

The Coriolis text size now responds to your text size changes in your device's Settings.

Fixes and improvements.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

SF Presidio ,

The Mystery Of The Spinning Earth Exposed!

Watch the pendulum swish back and forth. Will it knock over the next peg? Click! Down it goes. The next peg comes around. Will it fall, like it’s predecessor?

What’s going on? What’s this got to do with the rotation of our planet? Enter the vortex, and discover the truth!

If you go deeper into the app you can see if this behavior would be different on an extraterrestrial body. You can also find out how a spinning Earth causes wind, and storm patterns. Do winds blow in the same direction of both sides of the Equator? Invest in this app and find out.

App Privacy

The developer, Wendy Walker, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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