dark segment

dark segment

[′därk ‚seg·mənt]
(meteorology)
A bluish-gray band appearing along the horizon opposite the rising or setting sun and lying just below the antitwilight arch. Also known as earth's shadow.
References in periodicals archive ?
Alfred Preis, the Honolulu architect commissioned to design the memorial, was the witness to another dark segment of the war, having spent three months in the Sand Island Detainment Camp in Hawaii, due to his Austrian origin.
One contained the great oval BA plus a smaller anticyclonic white oval (AWO); another was the 'STB Remnant', a pale blue cyclonic circulation; and the third was a new dark segment of STB, which passed the GRS in late 2009 (Figures 1&3).
More conventional tenderizing processes, such as aging and chemical treatment, digest dark segments known as Z lines until they disappear.