This is a simple demonstration of parallax that can be performed easily in the classroom.
Sunspots appear as dark spots on the surface of the sun, even though they are at temperatures of thousands of kelvin. This demonstration shows this phenomenon in the classroom.
In this demonstration, the effect of stars appearing to twinkle is explored and explained.
This demonstration allows you to view the emission spectra from Hydrogen, Krypton and water vapour using a large diffraction grating. It can be done with any other emission tubes available.