apparent horizon
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
EXAMPLES FROM THE WEB FOR APPARENT HORIZON
No land points visible from the summit, except those bounding the apparent horizon, reach equal or greater altitude.
The tops of the clouds must not be more than five or ten degrees above the apparent horizon.
The introduction of a descending plane lowers the apparent horizon; that of an ascending plane elevates it.
RELATED WORDS AND SYNONYMS FOR APPARENT HORIZON
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.