Star-hop from Orion to Sirius, before they go earthsky.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from earthsky.org Daily Mail and Mail on Sunday newspapers.
If the moon orbited Earth on the same plane that Earth circles the sun, then we d have a total lunar eclipse at each full moon, and a total solar eclipse at each new moon. But that doesn t happen because the lunar orbit is inclined to Earth s orbit by about 5 degrees.