I don't know - "adore the rising sun" as an admonition to be taken literally strikes me as, with all due respect, far-fetched. Just doesn't seem in keeping with the oblique phraseology throughout the rest of the song, and does not seem Burnsian more generally. Although, as I think about it, I'm starting to see how it could be taken to mean, Be grateful that you've lived to see another day, and not thrown your life away for a lost cause ... hmmm ....