# How Large Would A Gas Giant Appear To Be To The Inhabitants Of An Earth-like Moon Orbiting it? [duplicate]

How large would a gas giant realistically appear to be on an Earth-like moon? I think a movie or two has portrayed them as very large, but that's an exaggeration, right? Depending on the size and orbital distance, is it possible that the gas giant might be barely visible during the day?

• Google found this beauty as the first item in my search: spacemath.gsfc.nasa.gov/weekly/10Page51.pdf Apr 9, 2018 at 17:59
• This depends on the sizes of the gasgiant and its moon as well as the distances evolved. You will find a detailed answer with pictures here: worldbuilding.stackexchange.com/questions/11505/… Could thus be also a duplicate. At least you should provide more details in your question (size of moon, gas giant, distances involved, etc.). Apr 9, 2018 at 18:07
• Can be readily calculated. refer to any high school trigonometry text, and plug in the gas giant's diameter and distance. Considering that Saturn is readily visible from Earth at night, and Jupiter is (usually) the 3rd brightest object in the night sky, after the Moon and Venus, it's going to be visible. Apr 9, 2018 at 19:39