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Update astronomical length units in Calc

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* lisp/calc/calc-units.el (math-standard-units): Update the
astronomical unit and the parsec, using their definitions by the
International Astronomical Union.
This commit is contained in:
Ulrich Müller 2023-10-10 11:58:03 +02:00
parent c34a425d4d
commit 36a8fe4ef2
1 changed files with 6 additions and 5 deletions
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11
lisp/calc/calc-units.el
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@ -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")