Sunday, March 19, 1972, looked like the perfect day to climb Mount Fuji. The temperatures were mild, the winds were calm — but forecasts warned of a low-pressure system approaching.
That year, Vernal Equinox Day, a public holiday, fell on a Monday. Back when Saturdays were still half workdays, a Monday off meant climbers would be able to take advantage of a three-day weekend for overnight treks.
AloJapan.com