 From the surface of Amalthea , Jupiter would look enormous : 46 degrees across , it would appear roughly 92 times larger than the full moon . Because Amalthea is in synchronous rotation , Jupiter would not appear to move , and would not be visible from one side of Amalthea . The Sun would disappear behind Jupiter 's bulk for an hour and a half each revolution , and Amalthea 's short rotation period gives it just under six hours of daylight . Though Jupiter would appear 900 times brighter than the full moon , its light would be spread over an area some 8500 times greater and it would not look as bright per surface unit . 
