Now that I have completed rereading volume I of Posnansky's book I find there is reason to add the following statement from the beginning of his volume II:

"Within the socle of the month of July [on the Sun Door], there is a little square having that sign which appears in Vol. I ... and which we had designated provisionally as 'feminine'. Today, after long years of study, we are convinced that this ideogram has no connection with sex; rather it is a variant, or more accurately, an abbreviation of the same sign which, in the form of a complicated ideograph, fills the 'interior of the socle' and on which the central figure, September, rests ... "

The 'complicated ideograph' is a cousin of the one which I believe is related to rei miro (GD13). We can compare the details of the two 'bent fishes', one on the chest and the other inside the socle of  the September Sun.

There are several issues to discuss here, first of all these: 1) If we expect to find signs of the moon on drinking vessels, then should we really expect to find signs of the moon on a sun door? 2) If the 'bent fishes' are alluding to the moon, then surely it must be only those parts of the moon which are illuminated by the sun? 3) Isn't it reasonable to expect that on a sun door the moon could be mentioned in conjunction with the sun (when sun visits the 'house' of the moon).

The Hawaiian rule that full moon and new year should coincide is another example of the relations between sun and moon. The sun hero Odysseus met Polyfemos at the other solstice, shouldn't that one too be a time of full moon? Isn't is possible (or even probable) that the 'Moon House' ideogram 'talks' about full moon at solstice?