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
The Moon and the Sun time to complete the special effects work. The Moon and the Sun The Moon and the Sun is a novel by American writer Vonda N. McIntyre, published in 1997. The book combines two major genres: science fiction and historical romance (also known as alternate history). It won the Nebula Award for Best Novel in 1997, beating out "A Game of Thrones" by George R. R. Martin. The novel was inspired by the short story (written in the form of a faux-encyclopedia article) "The Natural History and Extinction of the People of the Sea", also by McIntyre, which was illustrated by