Hold your arm at full length, close one eye and sight along the arm with the other eye. Then, based on how you hold your hand, you can measure different angles

The width of a full Moon, as viewed from the Earth's surface, is about 0.5 degree.
The width of the Sun, as viewed from the Earth's surface, is also about 0.5 degree.

Hold your hand at arm's length, and extend your little finger. The width of your little finger is about 1.5 degrees.

Hold your hand at arm's length, and extend your middle, ring, and pinky fingers, with the three fingers touching. The width of your three fingers is about 5 degrees.