In my glyph dictionary (GD37) I have written about henua as a concept defined by the rays of the sun. Glyphs showing double henua (in e.g. the calendar of the day) now has taken on a deeper meaning. There is a natural division in two because there is a navel string in the middle (the 'equator').

Strangely 'pito' means both 'navel' and 'navel string'. One would expect two different technical terms. I suppose that 'navel' was the original meaning; 'navel string' coming later. But I may be wrong. The word pito has a taste of bending and of toki te ragi. Of course then we should not think about the equator but of the limits of the sun. Cfr both piko and pito in my Polynesian dictionary.

Also what I have written (in GD53) about the 'string' (tui) in the Belt of Orion must then be a navel string. This navel string may once have been the central dividing line between the two half-years (winter and summer).

Sun determines the time of the day and also the time of the year. While writing these comments I am in parallel documenting the glyphs of Tahua. There I found this glyph (Aa5-81):

It is the same typ of glyph as in Saturday. Here in Tahua I get the impression that this glyph represents the country of darkness, I hesitate to write henua because that word may imply light. If my interpretation is correct, then I would be very surprised if this type of glyph occurred in double form.