Some (I Hope Mildly Interesting) Pedantry About Day of Week Frequency:

A commenter in a recent thread writes, "So, if election day was the first Tuesday, it would occasionally (I can't do the math for how often) fall on Nov. 1--All Saints Day."

Another responds, "Nov. 1 is a Tuesday, on average, once every seven years (the same amount it's a Monday, or a Sunday, or a Friday). The math's not that hard. :)"

The second commenter is basically right, for all practical purposes. But he's not exactly right, at least if he's saying that it's precisely equally common for Nov. 1 to fall on each day of the week. Why? The answer is below.