It may seem that I have gone far away from my statements about the henua type of glyph (GD37) originating from "the image of a wooden staff (kouhau). Such were used in different circumstances: measuring, memory aid (cutting marks in the wood), sign of power etc"

Periods of time (as e.g. in the calendar of the day) are symbolized by henua. And the Maya Indians seem also to have associated wooden staffs with time periods.

In addition I have tried to make a case for henua meaning measurement, implying (employing) both wooden staffs and the straight beams from the sun.

If we stand at the equator and the sun is straight up, then it must be equinox. The shadow of an absolutely straight staff is not there. If we are at a marae on one of those islands which von Dechen found and there is no shadow from the same staff standing upright, then it is solstice.

At the equator such a staff may be firmly planted in the ground to wait and see when equinox occurs, and the same goes for those two islands and the solstices.

If we are at the equator and find that an equinox has arrived, does the staff then mark the end of a half-year or the beginning of next half-year? I would say that we must have two staffs, one for the end of a half-year and one for the beginning of next half-year. That's why we also have double-hours in the calendar of the day. There must be two henua because we need two staffs.