I cannot seem to find any poetic names for "rainbow", something like how the Sun was given the poetic name "the eye of heaven" in Elizabethan England. and other delightful coinages like that. I highly doubt the wondrous bow in the clouds does not have some poetic names for it, seeing that it is considered one of Nature's most pretty pieces of poetic work.
For context, this is for a more "serious" poem alluding to the "rainbow" God made as his covenant to Noah in The Book of Genesis after the Great Flood, so I am not really looking for any names which may come across as seeming "cute". I would also be, ideally, looking for Early-Modern-English coinages, but later is fine too.
Any suggestions would be greatly appreciated.