The Only Use of
zenith
in
Brave New World
- Behind them, in the west, the crimson and orange were almost faded; a dark bank of cloud had crept into the zenith.†
p. 75.1
Definitions:
- 
(1)
(zenith) the highest point - physically or as a metaphor
- 
(2)
(meaning too rare to warrant focus) meaning too rare to warrant focus:
 Zenith is also common as a proper noun for the name of a city or company.