| LC control no. | sh 89005124 |
|---|---|
| LC classification | QB147 |
| Topical heading | Horizon |
| Variant(s) | Apparent horizon Celestial horizon Real horizon Sensible horizon |
| See also | Spherical astronomy |
| Found in | NASA. Random House. McGraw-Hill dict. sci. tech. (UF--Apparent horizon) Van Nostrand sci. encyc. (UF--Sensible horizon; real horizon) Encyc. astron. (UF--Celestial horizon) McGraw-Hill encyc. astron. (Visible horizon is the apparent boundary line between sky and earth or sea. Astronomical horizon is the great circle of the celestial sphere 90⁰ from the zenith and the nadir) Facts file dict. astron. Dict. astron., space atmos. phen. |
| Not found in | INIS:Thes.; INSPEC |
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