Editing Terminator (solar) (section)

===Surface transit speed===
[[File:ISS flies over Africa, the Mideast, and the Terminator line.ogv|thumb|Video of the Earth from the [[International Space Station|ISS]] as it approaches the terminator.]]
At the [[equator]], under flat conditions (without obstructions like mountains or at a height above any such obstructions), the terminator moves at approximately {{convert|463|m/s|mph}}. This speed can appear to increase when near obstructions, such as the height of a mountain, as the shadow of the obstruction will be cast over the ground in advance of the terminator along a flat landscape. The speed of the terminator decreases as it approaches the poles, where it can reach a speed of zero (full-day sunlight or darkness).<ref>''Venus Revealed'' by David Harry Grinspoon, page 329</ref>

[[Supersonic aircraft]] like [[Jet fighter#Second generation jet fighters (mid-1950s to early 1960s)|jet fighter]]s or [[Concorde]] and [[Tupolev Tu-144]] [[supersonic transport]]s are the only aircraft able to overtake the maximum speed of the terminator at the equator. However, slower vehicles can overtake the terminator at higher [[latitude]]s, and it is possible to walk faster than the terminator at the poles, near to the [[equinox]]es. The visual effect is that of seeing the sun rise in the west, or set in the east.