In
astronomy,
geography,
geometry and related sciences and contexts, a
plane is said to be horizontal at a given point if it is locally perpendicular to the
gradient of the
gravity field, i.e., with the direction of the gravitational force (per unit mass) at that point.In
radio science, horizontal plane is used to plot an
antenna's relative
field strength (which directly affects a station's coverage area) on a
polar graph. Normally the maximum of 1.000 or 0
dB is at the top, which is labeled 0o, running clockwise back around to the top at 360°. Other field strengths are expressed as a decimal less than 1.000, a percentage less than 100%, or decibels less than 0 dB. If the graph is of an actual or proposed installation,
rotation is applied so that the top is 0o
true north. See also the perpendicular
vertical plane.
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