Origin of azimuth
Examples from the Web for azimuthal
The deviation of a transit-instrument from the plane of the meridian at the horizon; it is also termed the azimuthal error.The Sailor's Word-Book|William Henry Smyth
I think, to the Azimuthal Arch of the Horizon included between the point of sunrise and that of sunset!
British Dictionary definitions for azimuthal
Word Origin for azimuth
Word Origin and History for azimuthal
"distance of a star from the north or south point of the meridian," late 14c., from Old French azimut, from Arabic as-sumut "the ways," plural of as-samt "the way, direction" (see zenith).