-1.428
At the time of the equinoxes, the sun's rays would be nominally tangent to the Earth at the north and south poles. Those are 90 degrees north and south of the equator respectively. Also I think at either 23.5 degrees north or 23.5 degrees south at sunrise and sunset.
The tangent ray refers to either the northernmost or southernmost hemisphere where the vertical rays refers to direct sun. During the June 21 solstice, the latitude rays in the northern hemisphere would be 66.5 degrees N (Arctic Circle)
The tangent of 75 degrees is: 3.7320507852401
Tangent of 30 degrees is 0.5770.577
The tangent of 89 degrees is: 57.3
Tangent is 0.5317
Tangent rays will hit any part of the earth on any day at sunrise and at sunset.
The question seems to be incomplete!
Tangent = 0.5
The tangent of 0.47 radians is about 0.508. The tangent of 0.47 degrees is about 0.00820.
Tangent rays are the migratory sun rays that skim over the earth's surface at high latitude locations (Polar Regions). These rays also occur during dusk and dawn at any latitude.
The inverse tangent is 0.83448691252602 degrees.