origin: from Latin "effulgēre" = to shine forth, from "fulgēre" = to shine
1. Luminescence from sun or other source.
2. Radiance; glory; shine.
OR PERHAPS YOU'D PREFER THE OPPOSITE, AS NIGHT WILL BE LASTING LONGER:
origin: from Latin = "tenebrōsus", from "tenebrae" = darkness
1. Dark or causing gloom; shut off from the light.
2. Murky; hard to understand.