Week 1 is the first week (starting on Monday) with the majority of its days in January. This year started on a Friday, so we only had 3 days in Jan in the week containing New Year. As a result, we ended up with 2020 having 53 weeks.
So, on the graph, Week 53 is Dec 28 to Jan 3, while Week 1 is Jan 4 to Jan 10. We’re currently in Week 10.
Quick explanation of the weeks. It’s not the first time you mention that.
The rest of the world uses this method of counting weeks: https://en.wikipedia.org/wiki/ISO_week_date.
Week 1 is the first week (starting on Monday) with the majority of its days in January. This year started on a Friday, so we only had 3 days in Jan in the week containing New Year. As a result, we ended up with 2020 having 53 weeks.
So, on the graph, Week 53 is Dec 28 to Jan 3, while Week 1 is Jan 4 to Jan 10. We’re currently in Week 10.