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master 36a8fe4ef21 1/2: Update astronomical length units in Calc
From: |
Ulrich Müller |
Subject: |
master 36a8fe4ef21 1/2: Update astronomical length units in Calc |
Date: |
Tue, 10 Oct 2023 09:01:30 -0400 (EDT) |
branch: master
commit 36a8fe4ef211218a61538a41f891308ce1a70bca
Author: Ulrich Müller <ulm@gentoo.org>
Commit: Ulrich Müller <ulm@gentoo.org>
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")