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) East of the Sun (and West of the Moon) "East of the Sun (and West of the Moon)" is a popular song written by Brooks Bowman, an undergraduate member of Princeton University's Class of 1936, for the 1934 production of the Princeton Triangle Club's production of Stags at Bay. It was published in 1934 and soon became a hallmark of the Princeton Tigertones, one of Princeton University's all-male a cappella groups. The standard is also sung by the Princeton Nassoons, Princeton University's oldest a cappella group. "East of the Sun" was first recorded by Hal Kemp for Brunswick Records on