Astronomy lesson 8 -Jupiter, Beehive cluster, Speed of light

Practical astronomy. Observing the Galilean moons of Io,Europa, Ganymede and Callisto. Noting a change in their orbital positions over two nights of observation. Using a digital camera with long exposure to take sky shots. Eyepiece astro pictures by holding up camera to eyepiece. Observing the beehive cluster, a swarm of stars in the constellation of Cancer. Learning how the speed of light was first calculated with some accuracy by Ole Romer. Check out my astro song, "Geminid Girl" available for mp3 download on routenote.com and songstall.com.