Full moon coming. (on D22)
Well, maybe the darkness is something else. The moon will be at its brightest on D22.
Speaking only about the Moon in Q's poem, and referring to the DARK TO LIGHt line:
The NEW moon, when it is at its darkest, was D7. FULL moon is D22.
D7 to D22, speaking only about the Moon, is DARK TO LIGHT.
YES. Another DARK TO LIGHT(this one SOLAR) when days begin to get longer.