The sky from here
Stars leave arcs. Point a camera at the sky and leave the shutter open for an hour: the stars draw arcs, all sharing one centre. That centre is the point the Earth's axis aims at. And every hour, everything shifts fifteen degrees westward.
Where this sits
- Opens up
- The Solar System, The Moon, The naked-eye sky
Exercises from this rung
Generated by the app, from easiest to hardest
How many degrees does the sky turn in an hour?
- Fifteen
- Three hundred and sixty
- One
- Ninety
Why Three hundred and sixty degrees in twenty-four hours is fifteen an hour. It is the oldest clock there is: an outstretched fist covers about ten degrees, so you can tell the time with your hand.