Orignially posted here: https://theotherside.timsbrannan.com/2022/12/review-hyperborea-products.html

Hyperborea Annual Calendar

PDF. 14 pages.

This is a great product. It is the 13 month, 28-day per month HYPERBOREAN calendar. It has the moon phases of the two moons, Phobos and Celene, and plenty of room to add your own details. While you need the RPG to use this for Hyperborea, it would work out well for a homebrew world if you liked.