residents of torrid zone, which "haue the Sunne twice euery yeere inside their zenith, and then they generate no shaddowes at all" [Nathanael Carpenter, "Geographie Delineated forth in 2 Bookes," 1635], from Medieval Latin Ascii, from Greek askioi, from a- "not, without," privative prefix (see a- (3)), + skia "shade, shadow" (see shine (v.)).
people who, at certain times of the season, have no shadow at noon; -- put on the residents for the torrid zone, whom have, every six months, a straight sunlight.
(n. pl.) Persons who, at peak times of the season, do not have shadow at noon; -- put on the residents associated with torrid area, with, twice a year, a vertical sun.