Why Is the Moon So Big?

Field notes

The page separates three effects that are often collapsed into one: the horizon-based Moon illusion, the limited pixel coverage produced by wide phone lenses, and the Moon’s real orbital variation. Its demonstrations keep the comparison concrete, including two 120-pixel Moons and a zoom control spanning 0.5× to 10×. It also gives the Moon an angular width of roughly 0.5° and notes that a near-perigee full Moon can be about 14% wider than a comparable distant one.