About the names
The names in this table are North American folk names, as popularised by The Old Farmer’s Almanac. They come from Native American, Colonial American and other traditional North American sources, and the Almanac notes that each tribe had its own names, often for a whole lunar month rather than a single night. Other cultures name the full moons differently.
The Harvest Moon is the full moon closest to the September equinox. Most years it falls in September; when it falls in October it takes October’s place, and the September full moon keeps the name Corn Moon.
A Blue Moon here means the second full moon in one calendar month. Because the month is counted in UTC, a full moon near midnight can be a Blue Moon in one time zone and not in another.
About the times
A full moon is an instant: the moment the Moon is exactly opposite the Sun in ecliptic longitude. We compute it with astronomy-engine and round to the minute; other almanacs may differ by a minute. To the eye the Moon looks full for about a day either side, so the night before or after is just as good for moon-watching.