SUBSCRIBE to the OFFICIAL BBC YouTube channel: https://bit.ly/2IXqEIn
LAUNCH BBC iPlayer to access Live TV and Box Sets: https://bbc.in/2J18jYJ
More about this programme: http://www.bbc.co.uk/programmes/b00wnvpf
One Show astronomer Mark Thompson explains why the stars change position in the night sky as each evening progresses. He does so with the help of a homemade planetarium created on the inside of an umbrella.
