HyperDic: observer[s_meridian

English > 1 sense of the expression *observer's meridian*:
NOUN	location	observer's meridian	a meridian that passes through the observer's zenith

English > *observer's meridian*: 1 sense > noun 1, location
Meaning	A meridian that passes through the observer's zenith.
Broader	meridian, line of longitude	An imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator