Amazing Factoid I've Pointed Out Before

Four years ago on Xmastime:

I do not subscribe easily to conspiracy theories. One being that we faked the moon landing.

Until I did a little research and realized that on this day 40 years ago, exactly ONE MLB team did not play a game that day.

The Houston Astros.

Wtf?

Okay, and the Cardinals. But still. 2 teams off, and one is the Astros?.......on that day....?