town - an urban area with a fixed boundary that is smaller than a city; "they drive through town on their way to work"

Magnolia State, Mississippi, MS - a state in the Deep South on the gulf of Mexico; one of the Confederate States during the American Civil War

great circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center

observer's meridian - a meridian that passes through the observer's zenith

prime meridian - meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)

magnetic meridian - an imaginary line passing through both magnetic poles of the Earth

date line, dateline, International Date Line - an imaginary line on the surface of the earth following (approximately) the 180th meridian