Claudius Ptolemy
Occupation
Mathematician, Astronomer, Geographer
Year born
100 AD
Research Areas
Movements of planets and stars, Cartography
Hypatia
Occupation
Astronomer, Mathematician, Philosopher
Year born
Sometime between 350 – 370 AD
Research interests
Geometry, Algebra
Nicolaus Copernicus
Occupation
Astronomer, Mathematician, Clergyman
Year born
1473
Research Areas
Planets, Mechanics
Electric Orrery
An Orrery is a moving, mechanical model of the Solar System. It shows how all of the planets orbit around the Sun.
Stargazing Glossary
Welcome to our stargazing glossary!
Here, you'll find key terms that will help you better understand the wonders of the night sky.
Distances in the Solar System Poster
How far apart are the planets in the Solar System. The answer may surprise you!
The distance between the planets in our Solar System is not regular. The inner 4 rocky planets are spaced much more tightly than the outer 4 giant planets.
Download, print and display this free poster!