Earth referred to as "moons", after Earth's. The gravitational attraction between Earth and the Moon causes tides on Earth. The same effect on the Moon has led to its tidal locking: its rotation period is the same as the time it takes to orbit Earth. As a result, it always presents the same face to the planet. As the Moon orbits Earth, different parts of its face are illuminated by the Sun, leading to the lunar phases; the dark part of the face is separated from the light part by the solar terminator. Due to their tidal interaction, the Moon recedes
East of the Sun and West of the Moon some candles, and tells her to light them at night, to see what is sharing her bed. The youngest daughter obeys, and finds he is a highly attractive prince, but she spills three drops of the melted tallow on him, waking him. He tells her that if she held out a year, he would have been free, but now he must go to his wicked stepmother, who enchanted him into this shape and lives in a castle east of the sun and west of the moon, and marry her hideous daughter, a troll princess. In the morning, the youngest daughter