Gravity of Earth or (). Gravitational acceleration contributes to the total gravity acceleration, but other factors, such as the rotation of Earth, also contribute, and, therefore, affect the weight of the object. Gravity does not normally include the gravitational pull of the Moon and Sun, which are accounted for in terms of tidal effects. It is a vector (physics) quantity, whose direction coincides with a plumb bob. A non-rotating perfect sphere of uniform mass density, or whose density varies solely with distance from the centre (spherical symmetry), would produce a gravitational field of uniform magnitude at all points on its surface. The Earth
Sun and Moon (Middle-earth) light of the Sun before it was tainted by Melkor when he ravished Arien. The name of Narsil, the sword of King Elendil (later reforged for Aragorn as Andúril), contains the elements "nar" and "thil," "fire" and "white light" respectively in Quenya, referring to the Sun and Moon. The Man in the Moon is even described in those writings, as being an old Elf who secretly hid on the island of the Moon, and built a minaret there. This is alluded to further in Tolkien's "Roverandom", in which the Man in the Moon also lives in a minaret. Combined with