Defaults are invented. Angles are in degrees. Azimuth is a compass bearing: 0 is north, 90 east, 180 south, 270 west. Time is solar time, not clock time. The obstruction is flat-topped and opaque, seen from one point.
-90 to 90. North is positive.
1 to 365. 21 March is 80, 21 June is 172, 21 December is 355.
0 to 360, read clockwise from north to the other edge.
0 to 360. A start above the end means the span passes through north.
Top of the obstruction above the point you look from.