Model of Ptolemy's ring used to measure the length of the year.
This is a model of the ring and method used by Claudius Ptolemy (2nd century A.D., Alexandrian astronomer) to determine the length of a year.
The ring is mounted...
Model of the solar system based on the five perfect solids.
Kepler attempted to describe the orbits of the planets in terms of the five regular polyhedrons. The polyhedrons, inscribed within one another define the distances of the planets...
What it shows: Long before the time of Copernicus, the Greek astronomer Claudius Ptolemy created a model of all the planets' observed celestial motions. The model involved combinations of perfect circles rotating with uniform speed. Ptolemy explained the...
Electrically driven machine to represent retrograde planetary motion according to Aristotle's theory of concentric spheres.
This is the realization of a proposed solution to retrograde motion put forward by Eudoxus (427 - 347 B.C.). Here a...
Working model to show Kepler's 1st and 2nd laws and the equivalence of the area law to the law of equants.
A demonstration illustrating the equivalence of Kepler's second law, the Law of Areas, with the Law of Angles.
In order...
Model to show celestial sphere; larger version has capacity to show lunar motions.
The position and motions of heavenly bodies are projected against a hypothetical sphere of infinite radius, centered on the Earth, called the Celestial Sphere...
Static model of site; can be used with light source to simulate a mid-summer's morning.
1:50 scale model of the Stonehenge site with the positions of Sun and Moon on important dates marked. It can be used with a light show to reproduce...
