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Starting development for calculating Jupiter's moons.

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I am starting the process of implementing calculation
of Jupiter's four largest moons: Io, Europa, Ganymede, Callisto.
This commit just contains constant declarations for the
equatorial, polar, and volumetric mean radii of Jupiter.

The positions of the moons will be related to the center
of Jupiter and be expressed in Jupiter equatorial radius units,
so I felt it would be good to give users a way to convert to
kilometers, which can in turn be converted to AU.
This commit is contained in:
Don Cross
2021-04-04 20:52:31 -04:00
parent 19aa193dc1
commit 9b67e7f3f9
22 changed files with 10192 additions and 9708 deletions
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21
source/python/README.md
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@@ -172,6 +172,27 @@ However, because Python defines the [angular conversion functions](https://docs.
---
<a name="JUPITER_EQUATORIAL_RADIUS_KM"></a>
### `JUPITER_EQUATORIAL_RADIUS_KM = 71492.0`
**The equatorial radius of Jupiter, expressed in kilometers.**
---
<a name="JUPITER_POLAR_RADIUS_KM"></a>
### `JUPITER_POLAR_RADIUS_KM = 66854.0`
**The polar radius of Jupiter, expressed in kilometers.**
---
<a name="JUPITER_MEAN_RADIUS_KM"></a>
### `JUPITER_MEAN_RADIUS_KM = 69911.0`
**The volumetric mean radius of Jupiter, expressed in kilometers.**
---
<a name="classes"></a>
## Classes

8
source/python/astronomy.py
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@@ -39,6 +39,14 @@ import re
KM_PER_AU = 1.4959787069098932e+8 #<const> The number of kilometers per astronomical unit.
C_AUDAY = 173.1446326846693 #<const> The speed of light expressed in astronomical units per day.
# Jupiter radius data are nominal values obtained from:
# https://www.iau.org/static/resolutions/IAU2015_English.pdf
# https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html
JUPITER_EQUATORIAL_RADIUS_KM = 71492.0 #<const> The equatorial radius of Jupiter, expressed in kilometers.
JUPITER_POLAR_RADIUS_KM = 66854.0 #<const> The polar radius of Jupiter, expressed in kilometers.
JUPITER_MEAN_RADIUS_KM = 69911.0 #<const> The volumetric mean radius of Jupiter, expressed in kilometers.
_CalcMoonCount = 0
_DAYS_PER_TROPICAL_YEAR = 365.24217