really it does becaues the sun is always using it's energy and gas so some day millions of years from now it will burn out of gas's and energy it will die
it is not the angle of the sun, but the Tilt of the earth as it orbits around the sun that impacts the number of hours of sunlight we experience in a day. During the summer the Northern Hemisphere is...
of course not. But the sun is somewhat special in the fact that it is a lone star, most stars exist as part of binary or tertiary systems and other multi star clusters.
The sun doesn't effect time, but the Earth's rotation (and the sun's apparent position) sets what we think of as time. After all, a clock is nothing but a mechanical sundial and clocks turn clockwise...