Annraoi,

I've looked and don't see much discussion on Dawning of the Day. However, you mentioned a different version. There are two in the DT. I also located two off-site which you might want to look at as well:

Dawning of the Day
Dawning of the Day (2)
Dawning of the Day - Contemplator site
Dawning of the Day / Fainne Geal an Lae - Ingeb/Volkslieder Site