![]() ![]() However, the term sunrise commonly refers to periods of time both before and after this point: Īrchitect Buckminster Fuller proposed the terms "sunsight" and "sunclipse" to better represent the heliocentric model, though the terms have not entered into common language.Īstronomically, sunrise occurs for only an instant: the moment at which the upper limb of the Sun appears tangent to the horizon. The illusion of a moving Sun results from Earth observers being in a rotating reference frame this apparent motion is so convincing that many cultures had mythologies and religions built around the geocentric model, which prevailed until astronomer Nicolaus Copernicus formulated his heliocentric model in the 16th century. 3.2 Optical illusions and other phenomenaĪlthough the Sun appears to "rise" from the horizon, it is actually the Earth's motion that causes the Sun to appear.
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