Related ongoing thread:
The Compact Calendar 2023-2024 - https://news.ycombinator.com/item?id=37869809 - Oct 2023 (15 comments)
31–32 of 32 posts
The Compact Calendar 2023-2024 - https://news.ycombinator.com/item?id=37869809 - Oct 2023 (15 comments)
Earlier quoted context omitted.
Your thumbs run vertically along the sides of the card, parallel to each other. You use them to cover anything to the sides of the month header(/footer) you're looking at. I think it's that "not under or above" description from the link that's confusing. Find the header/footer for the right month. Use your thumbs to cover everything to the right or left.
Doesn't a thumb then obscure the label of the month you're identifying?