Minute and second of arc (English Wikipedia)

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google.co.uk

"Minutes of Arc to Degree Conversion". Inch Calculator. Retrieved 25 July 2021.

"Astro Navigation Syllabus". Retrieved 4 November 2010. [Sextant errors] are sometimes [given] in seconds of arc, which will need to be converted to decimal minutes when you include them in your calculation.

"CELESTIAL NAVIGATION COURSE". International Navigation School. Retrieved 4 November 2010. It is a straightforward method [to obtain a position at sea] and requires no mathematical calculation beyond addition and subtraction of degrees and minutes and decimals of minutes

Bramwell, Denton (January 2009). "Group Therapy The Problem: How accurate is your rifle?". Varmint Hunter. 69. Archived from the original on 7 October 2011. Retrieved 21 May 2009.

"Shipmate GN30". Norinco. Archived from the original on 24 January 2008. Retrieved 4 November 2010.

Kaplan, George H. (1 January 2003). "Nautical mile approximates an arcminute". Ocean Navigator. Navigator Publishing. Retrieved 22 March 2017.

"Why is a minute divided into 60 seconds, an hour into 60 minutes, yet there are only 24 hours in a day?". Scientific American. SCIENTIFIC AMERICAN, a Division of Springer Nature America, Inc. 5 March 2008. Retrieved 25 July 2021.

Mann, Richard (18 February 2011). "Mil, MOA or inches?". Shooting Illustrated. Archived from the original on 10 November 2013. Retrieved 13 April 2015.

The Corporation of Trinity House (10 January 2020). "1/2020 Needles Lighthouse". Notices to Mariners. Retrieved 24 May 2020.

"Shipmate GN30". Norinco. Archived from the original on 24 January 2008. Retrieved 4 November 2010.
Mann, Richard (18 February 2011). "Mil, MOA or inches?". Shooting Illustrated. Archived from the original on 10 November 2013. Retrieved 13 April 2015.
Wheeler, Robert E. "Statistical notes on rifle group patterns" (PDF). Archived from the original (PDF) on 26 September 2006. Retrieved 21 May 2009.
Bramwell, Denton (January 2009). "Group Therapy The Problem: How accurate is your rifle?". Varmint Hunter. 69. Archived from the original on 7 October 2011. Retrieved 21 May 2009.

Weisstein, Eric W. "Arc Second". mathworld.wolfram.com. Retrieved 31 August 2020.