13 Oct,
moon in Pisces,
the 13th day of the 9th lunar month.
Japanese have been celebrating the 15th and the 13th moon for the past 1300 years.
15th night or potato moon (first harvest moon) - 15th day of the 8th lunar month
13th night or chestnuts moon (second harvest moon) - 13th day of the 9th lunar month
