And a Happy New Year to you, Dave.
Interesting article, and what a lovely word, nychthemeron, the complete cycle of day and night. Completely new to me, but OED has it. From the Greek, nycti, night, hemera, day. Here’s the first cite:
1682 H. MORE Annot. Lux Orientalis 115 Onely the shadowy Vale of the Night will be cast over them once in a Nycthemeron.