You're right, thanks. The claims in my comment require lots of qualification, are embarrassing without. I enjoy your a[s]t[ron]omic epoch year zero idea. One c

You're right, thanks. The claims in my comment require lots of qualification, are embarrassing without. I enjoy your a[s]t[ron]omic epoch year zero idea. One could start from much further back (eg beginning of universe, earth, modern humans, writing) but those would all be specific to the culture estimating them and to what that culture valued.