Meanings

tropopause

transient luminous event

polar mesospheric clouds

polar stratospheric cloud

outside Earth's atmosphere

eurozone

countries where Chinese characters are used or were historically used

countries that do not use Chinese characters in their writing

traffic area

public sphere

hour circle

within Earth's atmosphere

atmospheric nuclear test

home range

gravitational sphere (of a celestial body)

relegation zone

French-speaking world

Islamic world

sinophone world

German-speaking countries