From 36a8fe4ef211218a61538a41f891308ce1a70bca Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ulrich=20M=C3=BCller?= Date: Tue, 10 Oct 2023 11:58:03 +0200 Subject: [PATCH] Update astronomical length units in Calc * lisp/calc/calc-units.el (math-standard-units): Update the astronomical unit and the parsec, using their definitions by the International Astronomical Union. --- lisp/calc/calc-units.el | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/lisp/calc/calc-units.el b/lisp/calc/calc-units.el index 480b0bd818d..b0f31633bbb 100644 --- a/lisp/calc/calc-units.el +++ b/lisp/calc/calc-units.el @@ -57,12 +57,13 @@ ( ft "12 in" "Foot") ( yd "3 ft" "Yard" ) ( mi "5280 ft" "Mile" ) - ( au "149597870691. m" "Astronomical Unit" nil - "149597870691 m (*)") - ;; (approx) NASA JPL (https://neo.jpl.nasa.gov/glossary/au.html) + ( au "149597870700 m" "Astronomical Unit") + ;; "149 597 870 700 m exactly" + ;; http://www.iau.org/static/resolutions/IAU2012_English.pdf ( lyr "c yr" "Light Year" ) - ( pc "3.0856775854*10^16 m" "Parsec (**)" nil - "3.0856775854 10^16 m (*)") ;; (approx) ESUWM + ( pc "(648000/pi) au" "Parsec (**)") + ;; "The parsec is defined as exactly (648 000/π) au" + ;; http://www.iau.org/static/resolutions/IAU2015_English.pdf ( nmi "1852 m" "Nautical Mile" ) ( fath "6 ft" "Fathom" ) ( fur "660 ft" "Furlong") -- 2.39.2