Sun or moon 0.5°: Thumbnail (at arm's length) 1.5°: Fist (at arm's length) 8°-10°
||Human Homo sapiens
||John Moran eye center, Uni. of Utah, Webvision, the organization of the retina and visual system, Helga Kolb, Eduardo Fernandez and Ralph Nelson, link
||Wandell, B.A. (1995) Foundations of Vision. Sinauer Associates, Inc. Sunderland, Massachussets.
||Please note: Comparing the visual angle of thumbnail including flesh of thumb when arm is extended to sun in Israel, yields that the thumb is only twice as wide as the sun.