A full muin is the lunar phase that occurs when the Muin is completely illuminatit as seen frae the Yird. This occurs when the muin is in opposeetion tae the Sun (when it is on the opposite side o the Yird frae the Sun; mair precisely, when the ecliptic longitudes o the Sun an Moon differ bi 180 degrees).[1]

Photograph o the full muin as viewed through a 9.25 inch Schmidt-Cassegrain telescope. This muin was near its greatest northren ecliptic latitude, so the soothren craters are especially prominent.


  1. Seidelmann, P. Kenneth (2005). "Phases of the Moon". Explanatory Supplement to the Astronomical Almanac. University Science Books. p. 478. ISBN 0-935702-68-7. They are the times when the excess of the Moon's apparent geocentric ecliptic longitude λM over the Sun's apparent geocentric ecliptic longitude is 0, 90, 180, or 270 ...