I've read an article discussing transition of pictographs for Sun and Moon to hanzi. It raised following questions, but left them unanswered:
- Original pictographs for Sun is a circle with point in the center. What is the meaning of the point?
- There were added two horizontal lines (splitting it approximately in thirds) during the transition of Moon pictograph to hanzi. What is the meaning of those two lines?
I've searched through web and I have found some explanations, but they don't seem authoritative enough to me (not to mention doubts I have). For the Sun, the only explanation I've found is that the point means sun spot. As for the Moon, explanation stated that those lines mean cloud covering the Moon.
Could someone give me an explanation or recommend a book covering this problems?