By the way: In the sunboat there are 4 external marks, which ought to mean that there are 4 parts in 'summer'; it is to be regarded as a whole 'earth' in itself.

The upwards going internal marks in henua means - I now suggest - that the darkness does not apply to our 'earth' but to the 'earth' on the opposite side of the equator. North of the equator indeed 'summer' is shorter by about 3 days than 'winter'.

This suggestion also may explain why the hashmarks in henua for Sunday (in H) are going upwards: if you are able to observe the sun here and now, than on the opposite side of the earth there is darkness. This is a twist of course, because now we are not talking about north of the equator - not about the opposite 'earth' - but about the opposite earth.

I believe this will also explain why in Peru and on Easter Island (the only two places on earth) the boustrophedon was reversed: They really thought 'global' (not 'local' only).