body of water under cloudy sky during sunset

Usually, the term sky informally refers to a perspective from the Earth's surface; however, the meaning and usage can vary. An observer on the surface of the Earth can see a small part of the sky, which resembles a dome (sometimes called the sky bowl) appearing flatter during the day than at night.[1] In some cases, such as in discussing the weather, the sky refers to only the lower, denser layers of the atmosphere.