To specify an observer's location, humans will want to
work in latitude and longitude in degrees, optionally
with minutes and seconds. Latitudes are expressed as an
angle followed by letter
S (case-insensitive); longitudes are expressed
as an angle followed by letter
W. For the syntax of angles, see Section 4.2, “Specifying angles on command lines”.
34d08m42sn 107d50m37sw 41.86333N 78.961389W