Altitude is the angle measured above the horizon.
The angle of isolation, or the angle at which sunlight strikes the Earth's surface, affects the intensity of the sunlight. A higher angle of isolation, such as during midday when the sun is directly overhead, results in more concentrated sunlight and more heating of the Earth's surface. Conversely, a lower angle of isolation, like in the early morning or late evening, leads to less intense sunlight and less heating.
The point about which an angle is measured
the angle of incidence is the angle measured between the normal and the incident ray.. the angle of reflection is the angle measured between the reflected ray and the normal..
A reflex angle
With a protractor
Altitude is the angle measured above the horizon.
An angle is positive when it is measured in a counter-clockwise direction. It is negative when it is measured in a clock-wise direction.
The angle of incidence and reflection are measured with respect to the normal line, which is a line perpendicular to the surface at the point of incidence. The angle of incidence is measured between the incident ray and the normal line, while the angle of reflection is measured between the reflected ray and the normal line. Both angles are typically measured in degrees.
straight angle
Usually an angle is measured in degrees or radians.
Transit