Sunset

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The daily disappearance of the sun below the western horizon as a result of the earth's rotation.
The daily disappearance of the sun below the western horizon as a result of the earth's rotation.

Sunset The daily disappearance of the sun below the western horizon as a result of the earth's rotation.

In the United States, it is considered as that instant when the upper edge of the sun just disappears below the sea level horizon.

In Great Britain, the center of the sun's disk is used instead. Time of sunset is calculated for mean sea level.

The time of sunset is defined in astronomy as the moment the trailing edge of the sun's disk disappears below the horizon in the west. Due to refraction of light in the atmosphere, the ray path of the setting sun is highly distorted near the horizon making the apparent astronomical sunset occur when the sun’s disk is already about one diameter below the horizon.

Sunset should not be confused with dusk, which is the moment at which darkness falls, when the sun is about eighteen degrees below the horizon. The period between the astronomical sunset and dusk is called twilight.

[edit] Also See

[edit] Reference

  1. Wikipedia Sunset [1]


[edit] Examples;

  • 1. Timelapse - Sunset on MT. Ogden, Utah, by Brian Griffin see [2]
  • 2. Aspen, by Alex H see [3]

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