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 A217572 Decimal expansion of the conversion factor from radians to arcseconds. 10
 2, 0, 6, 2, 6, 4, 8, 0, 6, 2, 4, 7, 0, 9, 6, 3, 5, 5, 1, 5, 6, 4, 7, 3, 3, 5, 7, 3, 3, 0, 7, 7, 8, 6, 1, 3, 1, 9, 6, 6, 5, 9, 7, 0, 0, 8, 7, 9, 6, 3, 1, 5, 5, 7, 5, 7, 6, 9, 7, 6, 8, 7, 7, 9, 0, 0, 3, 3, 0, 2, 4, 9, 7, 3, 3 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 6,1 COMMENTS From Peter Munn, Aug 21 2020 and Nov 11 2020: (Start) Corresponds to a significant mark labeled with a (typographic) double prime symbol on slide rule calculating devices in the 20th century. The Pickworth reference explains its use for sines and tangents of small angles. As tangents of small angles can be approximated by the angle itself, this value approximates the cotangent of an arcsecond, and so, to within 1 part in 10^11, the number of astronomical units in a parsec, prior to its redefinition in August 2015. (End) Equals the number of astronomical units in a parsec, as defined in 2015. - Donghwi Park, Aug 08 2021 REFERENCES C. N. Pickworth, The Slide Rule, 24th Ed., Pitman, London, 1945, pp. 76-78, Trigonometrical Applications. LINKS Robert G. Wilson v, Table of n, a(n) for n = 6..1005 Peter Munn, Aristo 89 Slide Rule. Wikipedia, Parsec. Wikipedia, Minute and second of arc. FORMULA Equals 3600 * A072097. Equals 1/A155970. EXAMPLE 206264.806247096355156473... MAPLE evalf(180/Pi*3600) ; MATHEMATICA RealDigits[(180/Pi) 3600, 10, 75][[1]] (* Bruno Berselli, Oct 10 2012 *) PROG (Maxima) fpprec:77; ev(bfloat((180/%pi)*3600)); \\ Bruno Berselli, Oct 10 2012 CROSSREFS Related conversion factors: A155970 (arcseconds to radians), A072097 (radians to degrees), A337493 (radians to arcminutes). Sequence in context: A335790 A078991 A346790 * A021833 A196072 A261883 Adjacent sequences:  A217569 A217570 A217571 * A217573 A217574 A217575 KEYWORD cons,nonn,easy AUTHOR R. J. Mathar, Oct 10 2012 STATUS approved

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Last modified May 21 00:36 EDT 2022. Contains 353886 sequences. (Running on oeis4.)