The two types are apparent magnitude, the magnitude of a star as it appears to us, and absolute magnitude, which is what a star's apparent magnitude would be at a standard distance of ten parsecs.
Apparent magnitude is how bright celestial objects look to the naked eye, a person who is observing it from the earthâ??s surface. Absolute magnitude is the apparent magnitude of an object if it is located at the distance of 10 parsecs. A parsec is a unit of length in astronomy.
the computer is the device. the computer surface is the surface it sits on
the difference between this is that surface area
A surface current is on the surface and a deep water current is deep beneath the surface.
One is under ground, and one is on the surface.
The difference between roughness and flatness is that one, flatness, is the shape of an object. Roughness is the surface or texture of an object.