-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 latitude of the tangent rays in the Northern Hemisphere on June 21st is approximately 23.5 degrees north, which is known as the Tropic of Cancer. This is the northernmost point where the sun's rays are directly overhead during the summer solstice.
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.
The inverse tangent is 0.83448691252602 degrees.
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.