We often see photos of Earth from space, but it is rarely clear what percentage of Earth's hemisphere is actually visible from any particular orbit.
• Is there a graphic or diagram that would show the percentage of Earth's hemisphere that is visible from low Earth orbit? • high Earth orbit? • geosynchronous orbit? • lunar orbit? • 1 million miles? • the Sun?
• Alternatively, is there a graphic or diagram that would show the percentage of a mathematical hemisphere "seen" from various points at multiples of a sphere's radii?
• Is there a website with interactive graphics that can calculate the above?
• I am a fan of space exploration (and accurate graphics). My working knowledge of math and geometry is limited.