Editing Escape velocity (section)

=== From a rotating body ===
The escape velocity ''relative to the surface'' of a rotating body depends on direction in which the escaping body travels. For example, as the Earth's rotational velocity is 465&nbsp;m/s at the [[equator]], a rocket launched tangentially from the Earth's equator to the east requires an initial velocity of about 10.735&nbsp;km/s ''relative to the moving surface at the point of launch'' to escape whereas a rocket launched tangentially from the Earth's equator to the west requires an initial velocity of about 11.665&nbsp;km/s ''relative to that moving surface''. The surface velocity decreases with the [[trigonometric function|cosine]] of the geographic latitude, so space launch facilities are often located as close to the equator as feasible, e.g. the American [[Cape Canaveral Air Force Station|Cape Canaveral]] (latitude 28°28&prime;&nbsp;N) and the French [[Guiana Space Centre]] (latitude 5°14&prime;&nbsp;N).