Imagine looking at the position of Venus and using that to predict how much snow you'll get for the next decade.
It sounds ludicrous, but that's exactly what the Farmer's Almanac does. In 1792, the publication first used the mathematical formula for weather predictions created by Robert B. Thomas. Thomas looked at variables like sun spots, tidal patterns, and yes, the position of the planets. He even gave tips on counting things like persimmon seeds and colors on a wooly caterpillar.