LATITUDE and LONGITUDE
Here's a mnemonic means of remembering the difference between the two geographical means of measurement:
Greenwich (London) is at 0° long. and 51½°N. lat.
It also helps to recall that one often hears of Northern Latitudes or Southern Latitudes (describing climatic regions) but one never hears of plural Longitudes. The Tropics are good example of specific latitudes.
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