Encyclopedia  |   World Factbook  |   World Flags  |   Reference Tables  |   List of Lists     
   Academic Disciplines  |   Historical Timeline  |   Themed Timelines  |   Biographies  |   How-Tos     
Sponsor by The Tattoo Collection
Up
Main Page | See live article | Alphabetical index

Up

Up describes the positive z-value in a gravitational field, just as "down" represents the negative z-value. The z-axis is the only axis that is not apparently arbitrary. The x and y values, "North", "South", "East", and "West" do in fact exist (and are named relative to the direction of the Earth's spin) but are not readily apparent.

A computer or machine is said to be up when it's working properly, and down when it isn't.

In baseball, a player is described as being up when he is facing the pitcher.

See also: UP