The "sun" and “moon” parts are connected to the lyrics that speak of God's goodness supplied through “the sun, the moon, and the apple tree.”
So, yes, there really was a “Johnny Appleseed,” his real name “John Chapman,” born in Massachusetts in 1774. His mother died when he was only two, and he was raised by a father and stepmother. From his roots on the East Coast, he traveled westward, planting apple trees on the way. He'd get seeds for free from cider mills. At his death at age 70, he left behind thousands of apple trees and a reputation as a generous (albeit odd) person. Alas, history also provides some negative feedback on his life passion, saying the apples he planted were only good for making hard cider!
On the other hand, others point out that he spread not just apple seeds but compassion and kindness. The Disney cartoonists depicted him as a thin, happy guy. But Chapman lived before modern photography. Nobody really knows what he looked like. Still, the Disney movie's lively animation and catchy song helped cement the “core” (no pun intended) story about this unusual, generous man. I remember that film from my childhood! If you search his name on the internet, you'll come up with lots of interesting history on him.
But I think there's another lesson from Chapman's unusual passion. Somewhat remotely, it references Moses of the Old Testament. When God was singling out Moses to lead the amazing exodus of his kinsmen from Egypt to a new homeland, He started with Moses' staff. “What is in your hand?” God asked Moses about the old wooden shepherd staff he carried. If you don't recall what happened next to that staff...well, read Exodus 4 and onward for the next 40 miraculous years. What was in Chapman's hand (or his satchel)? Seeds. He also carried a simple faith in God along with the lifelong desire to spread something simple, yet good, wherever he went.
Next time you bite into a juicy apple, maybe remember that connection. And ask yourself: what physical or relational skill or tool has God put in your hand?