Horizontal bar below each Moon image represents time span from 6pm on the given day to 6am next day, its brightness corresponds to sky brightness: white is before astronomical twilight in the evening or after astronomical twilight in the morning; shades of grey correspond to the light coming from the Moon (scaled for Moon phase); black is the time when the conditions are supposed to be just right. Phases of the Moon should be useful for any geographical location, the detailed data (twilight, sunrise, etc) are computed for Ithaca, NY.