1 Not cisgender. Used to include people who do not have the same sex and gender but do not identify as transgender.  2013, Rebecca Borison, Penn Non-Cis fights underrepresentation on campus, The Daily Pennsylvanian (University of Pennsylvania), 13 January 2013:
Aside from the fact that the Moon, Earth and Sun don't orbit all in the same plane (as mentioned by Quora User's answer) there are two more reasons why the full moon can be seen during the day: 1  The full moon happens, as you correctly state, when the Sun, Earth and Moon are aligned.  That's no (full) moon!
The answer is the moon is a world in space, just as Earth is. Like Earth, itâs always half illuminated by the sun. In other words, the round globe of the moon has a day side and a night side. From our earthly vantage point, as the moon orbits around Earth, we see varying fractions of its day and night sides.