This is what I call the 6th period:
Still the moon is flying high, that is shown in the 3rd glyph from the left by the sign of the moon high above the wing of the tired old bird. It seems even to be flying higher than in the 4th period. This effect is due to both the tired old bird and the canoe of the moon being smaller than in the 4th period, which explains the gap between canoe and bird.
The canoe in the 1st glyph is also smaller and higher placed than usual. Probably this indicates that the moon now appears smaller than in the 4th period. In the 6th period the moon is more near the eastern horizon than when the moon is near the western horizon in the 4th period. Close to the horizon the moon looks like a canoe and in the 3rd glyph in the 6th period the canoe has come closer to the horizontal direction than in the 3rd glyph in the 4th period. The explanation for this assymetry is - I believe - due to the fact that the Waning Moon must include the dark period of the moon (as the Waxing Moon in this calendar seems to start with the first visibility of the moon).
In the 4th glyph only four of the usual six flames of the sun are seen. The explanation is probably that the stream of light from the sun now has shifted so that the moon will be illuminated from another direction. Reasonably this means that the flames used for illuminating the moon now are those placed to the left rather than those placed to the right (as in the Waxing Moon period). The flames from the right side (as seen from a point south of the equator) are used up.
The enigmatic extra sign towards the left in the last glyph I will not try to comment on for the moment.