Counting day to day, month to month.
New Year’s resolutions, and planning for what’s to come was covered in the post on Day 0.
Each of the 13 Days of the New Year (numbered 0-12), corresponds to its respective month (numbered 0-12) of the coming year.
The grey day here falls midway during the last quarter of the year, Month 11 Day 10 (November 5th). Curiously, there are holidays commemorating the dead from October 30th to November 11th, a span of 13 days of which November 5th is the midpoint.