Attention corn growers. According to the Old Farmer's Almanac, you should wait to plant your corn until "the oak leaf is as big as a squirrel's ear." Consequently, since this particular course of agricultural action obviously seems to require such an inconvenient and tiresome comparison, I would suggest that you don't bother planting corn at all, but simply obtain the quantity you need from a nearby grocery store instead because it is so relatively cheap to buy. Let some other damn fool farmer waste his valuable time measuring squirrel's ears!
For you and I, we are more concerned with moonlight and its invigorating turnips. And they take a lot of work.