Does the moon or sun have the greatest impact of earth? and why?

the sun

Explanation:

if the sun dies everything dies with it

While the sun and moon both have tremendous impacts on earth, the sun definitely has the greater impact.

Explanation:

This is because while the moon's gravitational pull has a great effect on the ocean and tides, the sun literally heats up the planet to the exact inhabitable degree, as well as makes up our day/night schedule