Tuesday, August 20, 2013 – a Published August 20, 2013 at 720 × 576 in Tuesday, August 20 – 2 232 (a): August 20Once in a blue moon 232 (a): Tuesday, August 20, 2013 – Once in a blue moon – There are usually three full moons in a season and farmers named them to keep time. Sometimes there are four moons in a season and the “extra third” was called “Blue”.