Spring and Autum Equinox, March 16 and September 23
Spring Ohigan Service - March 18
Fall Ohigan Service - September 23

These are periods to meditate on the harmony of nature and to develop harmony in ourselves.
"Higan" means "the other shore" (of nirvana). Emphasis is placed on the Six Paramitas which lead to "the other shore". Paramita is the Sanskrit for "gone to the other shore".