Nadir is employed during remote sensing of the atmosphere, as well as when an astronaut faces the Earth while performing a spacewalk. The term nadir can also be used to represent the lowest point reached by a celestial body during its apparent orbit around a given point of observation. This can be used to describe the location of the Sun, but it is only technically accurate for one latitude at a time and only possible at the low latitudes. The sun is said to be at the nadir at a location when it is at the zenith at the location's antipode
American (word) American (word) The meaning of the word American in the English language varies according to the historical, geographical, and political context in which it is used. "American" is derived from "America", a term originally denoting all of the New World (also called the Americas). In some expressions, it retains this Pan-American sense, but its usage has evolved over time and, for various historical reasons, the word came to denote people or things specifically from the United States of America. In modern English, "American" generally refers to persons or things related to the United States of America; among native English speakers