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Original file (SVG file, nominally 602 × 153 pixels, file size: 9 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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.
US Navy Twilight time calculator : "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.
Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."
This image is believed to be non-free or possibly non-free in its home country, Australia. In order for Commons to host a file, it must be free in its home country and in the United States. Some countries, particularly other countries based on common law, have a lower threshold of originality than the United States.
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