When I first saw the article on reddit, I tried to see if I could figure it out myself, by trying to imagine motion of moon and Earth. But I couldn't. Then I w

When I first saw the article on reddit, I tried to see if I could figure it out myself, by trying to imagine motion of moon and Earth. But I couldn't. Then I went to the article and was skimming through it. Just gave up when I hit this imagine "race track" thing. Was too lazy at that point in time. However the wikipedia picture did it in seconds. I didn't even have to read the above quote :) Just proves that "a picture is worth a thousand words"