How ever insightful, and you do make some good points, they are written as if we just remove the Christian faiths and run from there.
Although I did move a bit off topic, engaging in what we could do, I didn't think I just argued to remove Xian faiths. That is to say I thought I started by answering on topic and then moving off topic.
I'll try and repeat my post but keep it on topic.
Without religion, we'd probably have kept using the style of dating we'd used up through the 1500's which was picking one, if not more, important events and stating how much time has passed since then. It was usually from local or regional leaders. That is the same method you are suggesting the Japanese date things. It was actually a pretty universal method.
Of course the judeo-xian calendars would be right out without religion.
Once the world became more globalized and trade became important we probably would have adopted the longest running non-religion based system which is the chinese calendar.
In our imaginary secular world that would never have been thought of, So with out the deification of kings and such would they have held the same power?
Actually this is not true nor required. It was quite practical to date the years of a political leader's reign. Apparently scribes would often list more than one set of dates on papers including dukes and barons and such and they didn't have to be divine at all.
The planetary alignment scheme is interesting, and may have held sway if astronomers or astrologists gained in prominence. It does seem a bit complicated though. I tend to think that if the drive for uniform dating came more recently, it would be based on history/prehistory (written). It would be practical and have historical relevance. It would also be humanist, which might be more appealing than purely scientific/abstract concepts like celestial alignments.
You could be right though.
holmes
"...what a fool believes he sees, no wise man has the power to reason away.."(D. Bros)
"Don't believe I'm taken in by stories I have heard, I just read the Daily News and swear by every word.."(Steely Dan)