local horizon

horizon

i. In general, the apparent or visible junction of the earth and sky, as seen from any specific position. Also called a visible or local horizon.
ii. When an apparent boundary is modified by refraction, terrain, or other factors, it is called an apparent horizon.
iii. A small circle on the celestial sphere, the plane of which passes through the observer's eye and is parallel to the observer's rational horizon, is called a sensible horizon.
iv. A path followed by a radar beam when it is tangential to earth is a radar horizon.
v. The locus of the point at which direct rays from a terrestrial radio transmitter become tangential to the earth is a radio horizon.
vi. A line resembling the visible horizon but above or below it is called a false horizon.
vii. An artificial horizon is a gyroscopic instrument for indicating the attitude of an aircraft with respect to the horizontal. See artificial horizon.

单词	local horizon
释义	DictionarySeehorizon local horizon horizon i. In general, the apparent or visible junction of the earth and sky, as seen from any specific position. Also called a visible or local horizon. ii. When an apparent boundary is modified by refraction, terrain, or other factors, it is called an apparent horizon. iii. A small circle on the celestial sphere, the plane of which passes through the observer's eye and is parallel to the observer's rational horizon, is called a sensible horizon. iv. A path followed by a radar beam when it is tangential to earth is a radar horizon. v. The locus of the point at which direct rays from a terrestrial radio transmitter become tangential to the earth is a radio horizon. vi. A line resembling the visible horizon but above or below it is called a false horizon. vii. An artificial horizon is a gyroscopic instrument for indicating the attitude of an aircraft with respect to the horizontal. See artificial horizon.
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