The Sun passes through thirteen constellations on its path through the sky (called the ecliptic). In fact there are as many as 21 astrological constellations all together. What does it mean if Uranus is in Scutum? Sounds painful.
Spectrometers are used, like prisms, to spread light out into the component colours. This enables us to understand the compositions of everything from stars to streetlights. Here I show you how to make your own spectrometer and give you a few examples of what you can see with it.
Copyright © 2010 Robert J. Simpson. Twitter @orbitingfrog
