Question

The sun is at an altitude of 300 to the horizontal. What is the corresponding air mass?

Answer 1

The air mass corresponding to a solar altitude of 300 is not possible as the sun's altitude varies between 0° and 90°. When the sun is at an altitude of 0°, it is on the horizon and when it is at an altitude of 90°, it is directly overhead. If you could provide more context or specify what you mean by an altitude of 300, I may be able to provide a more accurate answer.

Hope this helps.