It keeps you alive. Other than that, it's just cute.
for all intents and purposes, the sun is the only solar energy there is.
A tomato (sun dried or not) is a fruit. For culinary purposes it is a vegetable
It blocks out the harmful rays of the sun.
The distance between them is so vanishingly small that for all practical purposes, it's entirely negligible.
The sun doesn't revolve around the earth the Sun is for all intents and purposes stationary1. The Earth Rotates around the sun as do all the other planets.----------------------------------------------------------------------------------------------------1For all intents and purposes that is quite correct, however, the Sun is in fact orbiting the center of the Milky Way at approximately 220 km/sec, which is far faster than any of the planets that orbit around the Sun. We don't notice it, because we are also orbiting the Milky Way along with the Sun.
Put it out in the sun and wind and turn/move it constantly, nothing beats the sun and a steady dry wind for drying.
Geothermal energy is a renewable source that does not depend on the sun. It involves harnessing heat from the Earth's interior to generate electricity or for heating purposes.
The material that was used for writing purposes in Egypt was the Papyrus stalk. Strips were cut and glued together with Nile water. They were then cross layered and dried in the sun.
You can't use the same bit of sunlight twice, if that's what you mean, but for our purposes the sun's energy is inexhaustible.
For all practical purposes, they can be assumed to be parallel but, strictly speaking, they are very slightly divergent.
Our Sun, as with all other stars in our galaxy, orbits the center of the galaxy, which is presumed to be a black hole. (Technically, the Sun orbits the planets, too . . . that is, they orbit each other. But the effect on the Sun's movement is so slight that it can be ignored for general purposes.)
Approximating Earth as a point object is close enough for most practical purposes. The diameter of Earth is insignificant, compared to the distance to the Sun.