Learn AstronomyLearn the basics of astronomy with historical background and an introduction to the basic astronomy concepts, details about planets, satellites, asteroids, comets and meteors. Also learn the history of Astronomy from its origins in the religious, mythological, and astrological practices of prehistory through to modern astronomy.
The brightest planets line up in the sky and you can spot planetary conjunctions with just your eyes. Wrap up warm, head outside and look!
A look at what light is together with how we use spectroscopy and spectrometry to better understand the universe and composition of stars.
Redshift and Blueshift are visible effects of the Doppler effect which you may have heard when a siren approaches and passes you by.
Use this Astronomy Equations Cheat Sheet to help find the equations you are looking for, then see the relevant page for tutorials and how to use the equations.
Hipparchus first calculated how far away is the Moon in 190BC using a simple method involving trigonometry and was accurate to 1,000km!
How large is the Earth, and how do we know that? Greek mathematician Eratosthenes calculated the size of the Earth in 200BC with a stick!
A guided tour of the solar system from the Sun to the Oort Cloud stopping off at the major attractions along the way like the asteroid belt.