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
Sun and Moon (Middle-earth) the Narsilion, the "Song of the Sun and Moon". The published "Silmarillion" states that the Sun was created by the Vala Aulë; he and his people made a vessel to hold the radiance of the last fruit of Laurelin. The vessel of the sun was guided by Arien, a Maia. Names of the Sun amongst the Elves included Anar or "The Fire-golden", a name given to it by the Vanyar; Anor, the common name for the Sun in Sindarin, as seen in "Minas Anor" (later Minas Tirith) and the Gondorian province of "Anórien"; and Vása, or "Heart of Fire", a