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<iframe width="560" height="315" src="https://www.youtube.com/embed/49RztN4Bqu0" frameborder="0" allowfullscreen></iframe> Beyond an explanation of it being an illusion, some interesting brain stuff is mentioned.

1/2 of a degree as an angular measurement. Same as the Sun, coincidentally, allowing the eclipses to work as they do. http://coolcosmos.ipac.caltech.edu/cosmic_classroom/cosmic_reference/angular.html 360 suns or moons would stack side to side, from horizon to horizon. I believe its an annular...