For a full Description see Finding the curvature of the Earth.
Click a Button to Start a Demo. Click again to skip one step. Click the Animation to start/stop. See also Controls below.
Please read the paragraph on Refraction to get familiar with this panel.
Use this Formular to convert between different lengh units. You can Copy/Paste the results into input fields in the other Forms.
Use this panel to save a certain App state by Get App State and use Copy/Paste to save the state in an external text file. Use Copy/Paste to copy a saved state from an external text file into this panel and click Set App State to activate this state. You can change the Parameters in this panel and apply them by pressing the RETURN button on the keyboard.
Use Get App Url to get an URL containing the current App State. Click Set App State oder copy the URL into any browser address field to go to this page and display the current App State.
The App can be called with URL some parameters to set a specific App State:
You can use the Save/Restore Panel with the Button Get App URL to get an URL from the current state of the App. Copy this URL into any Web-Form (e.g. YouTube comment) and by clicking the link this page is opened with the saved state from the URL.
Some parameters may be combined in one URL, eg, &custom=CustomDemo&demo=Custom&play=3&tab=Refr