Nadir
NADIR (Arabic nadir, " opposite to," used elliptically for nafir-es-semt, " opposite to the zenith "), a term used in astronomy for the point in the heavens exactly opposite to the zenith, the zenith and nadir being the two poles of the horizon. It is thus used figuratively of the lowest depth of a person's spirits or the lowest point in a career.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
