We should avoid trying to squeeze out precise and full meanings from all the glyphs in the calendar of the week. Untrue statements - even if labeled as only ideas - have a nasty tendency gradually to change into statements of belief.
Therefore it is better now to try to get the larger picture. As I perceive this there is a pattern which dominates the three calendars (the week, the month and the year). This pattern is what life instructs us: birth, growth, maturity, decay, death and resurrection.
I believe that this pattern can be more or less clearly observed everywhere in the three calendars. Take Sunday as an example. In the morning Sun is rising by way of a canoe arriving at the horizon in the east. He grows larger and warmer as the day continues. After a maximum there is a gradual lessening of his power. In the evening, at sunset, even the Sun 'dies':
With some imagination the canoe of the Sun (no. 2 from the left) and the tired old Sun (no. 5) can be seen. But what about nos. 3 and 4?
No. 4 perhaps is showing the Sun as its maximum, with full power flying high above like his Egyptian counterpart Horus the falcon.
No. 3 could then be the Sun at an earlier stage. The glyph looks like a person hanging upside down. I think it may very well represent the initiation phase (when a young person must 'die' in order to reach maturity and manhood).