1. The existence of moon doesn't depend on sun however moon light depends on sun as sun light incident on moon and reflected to the earth.
2. The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun.
3. With the Earth-Moon system, gravity is like a rope that pulls or keeps the two bodies together, and centrifugal force is what keeps them apart. Because the centrifugal force is greater than the Moon's gravitational pull, ocean water on the opposite side of the Earth bulges outward.
4. A lunar eclipse occurs when the Earth passes between the Moon and the Sun, and the Earth's shadow obscures the moon or a portion of it. A solar eclipse occurs when the Moon passes between the Earth and the Sun, blocking all or a portion of the Sun.
5. In particular, the Sun is essentially unaffected by Earth or the Moon. The tug of gravity from Earth has a very tiny effect upon the Sun - almost certainly not noticeable compared to the effects that may be produced by Jupiter or Saturn.
The Earth ''depends'' upon the Sun to stay in an orbit, and it ''depends'' upon the Sun for the radiant energy and light it produces. More specifically, the plants and animals on Earth depend on these things. Quite frankly, the large ball of rock under our feet doesn't care. Period.
And of course, the Moon creates tides - that are rather important in various ways to the flora and fauna of Earth.
So the Moon ''depends'' upon the Earth as a focal point for its own orbitting.
