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HandWiki. Broken/Angular Diameter. Encyclopedia. Available online: https://encyclopedia.pub/entry/32854 (accessed on 28 September 2026).
HandWiki. Broken/Angular Diameter. Encyclopedia. Available at: https://encyclopedia.pub/entry/32854. Accessed September 28, 2026.
HandWiki. "Broken/Angular Diameter" Encyclopedia, https://encyclopedia.pub/entry/32854 (accessed September 28, 2026).
HandWiki. (2022, November 04). Broken/Angular Diameter. In Encyclopedia. https://encyclopedia.pub/entry/32854
HandWiki. "Broken/Angular Diameter." Encyclopedia. Web. 04 November, 2022.
Broken/Angular Diameter
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The content is sourced from: https://handwiki.org/wiki/Broken/Angular_diameter

The angular diameter, angular size, apparent diameter, or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view. In the vision sciences, it is called the visual angle, and in optics, it is the angular aperture (of a lens). The angular diameter can alternatively be thought of as the angle through which an eye or camera must rotate to look from one side of an apparent circle to the opposite side. Angular radius equals half of the angular diameter.

angular diameter angular measurement apparent size

References

  1. This can be derived using the formula for the length of a cord found at "Circular Segment". Archived from the original on 2014-12-21. https://web.archive.org/web/20141221042937/http://mathworld.wolfram.com/CircularSegment.html. Retrieved 2015-01-23. 
  2. "A Taylor series for the functionarctan". Archived from the original on 2015-02-18. https://web.archive.org/web/20150218190328/http://www.mathstat.concordia.ca/faculty/rhall/mc/arctan.pdf. Retrieved 2015-01-23. 
  3. "Coordinate Systems". https://dept.astro.lsa.umich.edu/ugactivities/Labs/coords/index.html. 
  4. "Photographing Satellites". 8 June 2013. https://www.bartbusschots.ie/s/2013/06/08/photographing-satellites/. 
  5. Wikiversity: Physics and Astronomy Labs/Angular size
  6. Michael A. Seeds; Dana E. Backman (2010). Stars and Galaxies (7 ed.). Brooks Cole. p. 39. ISBN 978-0-538-73317-5. 
  7. http://www.google.com/search?hl=en&hs=3cj&q=arctan%286ft+%2F+12756.3+Km%29+in+arcseconds&btnG=Search
  8. 800 000 times smaller angular diameter than that of Alnitak as seen from Earth. Alnitak is a blue star so it gives off a lot of light for its size. If it were 800 000 times further away then it would be magnitude 31.5, at the limit of what Hubble can see.
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