Gan De
Occupation
Astronomer, Mathematician
Year born
Around 400 BCE
Research Areas
Jupiter’s movements, Star maps, Sunspots
- Early Life
There is very little known about Gan De’s life and work, but we do know he was one of the first Chinese astronomers.
- Career Highlights
Gan De wrote at least 2 books: ‘Treatise on Jupiter’ and ‘Astrological Predictions’. His books have since been lost and are no longer available. We know about his work because later astronomers have made reference to it.
Galileo Galilei
Occupation
Astronomer, Mathematician, Engineer
Year born
1564
Research Areas
Speed, Velocity, Motion, Astronomy, Tides
- Early Life
Galileo was born in Pisa, in the Duchy of Florence (now a part of Italy).
He went to university in Pisa to study medicine. However, after a short while he chose to focus on philosophy and maths instead.
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!
Planet Facts Posters
Do you know how many planets in our Solar System have rings? Or how many have moons? Learn some interesting facts about the planets in our Solar System with these free printable posters!