From the Haʻamonga ʻa Maui, if you look out to the east, you can see three clearings into the trees. In fact all three are passages thru the trees that lead straight to the ocean. This, apparently served as a calendar. If the sunrise was visible thru one of them, it meant it was one of the solstices or an equinox. That was the cue to go harvest stuff from underground or from the trees.