File:Sunrise-Sunset angle.svg

Original file (SVG file, nominally 1,017 × 518 pixels, file size: 70 KB)

This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.

Summary

DescriptionSunrise-Sunset angle.svg	English: A diagram of the sun at sunrise or sunset, showing the effects of atmospheric refraction. The sun's angular radius is 16 arcminutes, and the average atmospheric refraction is 34 arcminutes. These combine to cause the sun to remain visible until it is 50 arcminutes below the horizon.
Date	8 December 2011
Source	Own work; US Navy Twilight time calculator (new link): "For computational purposes, sunrise or sunset is defined to occur when the geometric zenith distance of center of the Sun is 90.8333 degrees. That is, the center of the Sun is geometrically 50 arcminutes below a horizontal plane. For an observer at sea level with a level, unobstructed horizon, under average atmospheric conditions, the upper limb of the Sun will then appear to be tangent to the horizon. The 50-arcminute geometric depression of the Sun's center used for the computations is obtained by adding the average apparent radius of the Sun (16 arcminutes) to the average amount of atmospheric refraction at the horizon (34 arcminutes)."
Author	TWCarlson
Other versions	English Galician

Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:

This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.

You are free:

to share – to copy, distribute and transmit the work
to remix – to adapt the work

Under the following conditions:

attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

You may select the license of your choice.

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	13:28, 19 December 2011	1,017 × 518 (70 KB)	TWCarlson	x
	20:13, 8 December 2011	1,072 × 498 (66 KB)	TWCarlson	x
	20:08, 8 December 2011	1,072 × 498 (381 KB)	TWCarlson	x
	20:00, 8 December 2011	1,072 × 525 (218 KB)	TWCarlson	Fixing more text problems
	19:39, 8 December 2011	640 × 320 (205 KB)	TWCarlson	Fixed text problem
	19:36, 8 December 2011	640 × 320 (53 KB)	TWCarlson	Adjusted nominal size more
	19:13, 8 December 2011	2,827 × 1,418 (223 KB)	TWCarlson	Decreased nominal size and added white background
	19:01, 8 December 2011	5,670 × 2,841 (209 KB)	TWCarlson	{{Information \|Description ={{en\|1=Diagram of the sun's position at sunrise and sunset.}} \|Source ={{own}} \|Author =TWCarlson \|Date =2011-12-08 \|Permission = \|other_versions = }}