1
: an arc of the horizon measured between a fixed point (such as true north) and the vertical circle passing through the center of an object usually in astronomy and navigation clockwise from the north point through 360 degrees
2
: horizontal direction expressed as the angular distance between the direction of a fixed point (such as the observer's heading) and the direction of the object
- 1 horizon
- 2 zenith
- 3 star
- 4 meridian
- 5 vertical circle
- 6 azimuth
- 7 observer
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Merriam-Webster unabridged
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