The Solar Spectrum with a digital camera
The other day, whilst teaching a lab I decided to get a simple spectrometer out and aim it at the day lit sky. This allows you to observe the solar spectrum without the chance of blinding yourself (you should never stare or aim any optical aid at the Sun). I then placed my digital camera on the end of it and aligned it roughly to get:
The dark bands on the images are absorption lines in the Solar spectrum with the dominant lines being called the Fraunhoffer Lines. These are a set of spectral lines in the solar spectrum that are caused by absorption by those elements in the upper layers of the Sun.