<P> Sunrise or sun up is the instant at which the upper edge of the Sun appears over the horizon in the morning . The term can also refer to the entire process of the Sun crossing the horizon and its accompanying atmospheric effects . </P> <P> Although the Sun appears to "rise" from the horizon, it is actually the Earth's motion that causes the Sun to appear . The illusion of a moving Sun results from Earth observers being in a rotating reference frame; this apparent motion is so convincing that most cultures had mythologies and religions built around the geocentric model, which prevailed until astronomer Nicolaus Copernicus first formulated the heliocentric model in the 16th century . </P> <P> Architect Buckminster Fuller proposed the terms "sunsight" and "sunclipse" to better represent the heliocentric model, though the terms have not entered into common language . </P>

What causes the sun to rise and set
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