Nadir Bluff (77°58′S 160°27′E) is a bluff (2,355 m) which forms a shoulderlike projection from the east side of Mount Feather in the Quartermain Mountains, Victoria Land. One of a group of names in the area associated with surveying applied in 1993 by New Zealand Geographic Board (NZGB); nadir being opposite of zenith and the direction of gravity as defined by a plumb line.
This article incorporates public domain material from the United States Geological Survey document "Nadir Bluff" (content from the Geographic Names Information System).
References
Nadir Bluff Wikipedia(Text) CC BY-SA