This model is based on Peterhouse MS 75.I. It was created by Ben Blundell (section9.co.uk) and Seb Falk (University of Cambridge) in collaboration with Scott Mandelbrote. The project was undertaken by permission of the Master and Fellows of Peterhouse, Cambridge, and supported by the generosity of Dr. Joe Pesce.
To operate the Equatorie model, follow the steps:
You can rotate the equatorium by holding down the left mouse button and moving the mouse. You may also use a finger on your touch-screen device. To zoom in and out, use the slider on the left of the screen (you can also use your mouse wheel or an equivalent gesture on your touch screen device). To move the entire disc, click and hold the right mouse button over the disc, then move the mouse. On a touch device, use a two-finger swipe.
You may move the strings by clicking and holding the mouse button over the pin attached to the string. To move the epicycle, click and hold the mouse over the epicycle, then move the mouse.