
          AU     ,   eccentricity, inclination to ecliptic, Longitude of ascending node, Longitude of perhillion, Mean longitude

Values prior to Mar 2006 from ssd.jpl.nasa.gov/?planet_pos
;;Mercury 
     [ [ 0.38709893d, 0.20563069, 7.00487,  48.33167,  77.45645, 252.25084 ], $
;Venus  
     [ 0.72333199d, 0.00677323, 3.39471,  76.68069, 131.53298, 181.97973 ], $ 
;Earth
     [ 1.00000011d, 0.01671022, 0.00005, -11.26064, 102.94719, 100.46435], $
;Mars 
     [ 1.52366231d, 0.09341233, 1.85061,  49.57854, 336.04084, 355.45332], $
;Jupiter
     [ 5.20336301d, 0.04839266, 1.30530, 100.55615,  14.75385,  34.40438], $ 
;Saturn
     [ 9.53707032d, 0.05415060, 2.48446, 113.71504,  92.43194,  49.94432], $
;Uranus
     [19.19126393d, 0.04716771, 0.76986,  74.22988, 170.96424, 313.23218], $ 
;Neptune
     [30.06896348d, 0.00858587, 1.76917, 131.72169,  44.97135, 304.88003], $
;Pluto
     [39.48168677d, 0.24880766,17.14175, 110.30347, 224.06676, 238.92881] ]

Supplie since Mar 2006 at ssd.jpl.nasa.gov/?planet_pos
For time span 1800 AD to 2050 AD
;Mercury 
     [ [ 0.38709927d, 0.20563593, 7.00497902,  48.33076593,  77.45779628, 252.25032350 ], $
;Venus  
     [ 0.72333566d, 0.00677672, 3.39467605,  76.67984255, 131.60246718, 181.97909950 ], $ 
;Earth
     [ 1.00000261d, 0.01671123, 0.00001531,  0.0, 102.93768193, 100.46457166], $
;Mars 
     [ 1.52371034d, 0.09339410, 1.84969142,  49.55953891, -23.94362959, -4.5534320], $
;Jupiter
     [ 5.20288700d, 0.04838624, 1.30439695, 100.47390909,  14.72847983,  34.39644051], $ 
;Saturn
     [ 9.53667594d, 0.05386179, 2.48599187, 113.66242448,  92.59887831,  49.95424423], $
;Uranus
     [19.18916464d, 0.04725744, 0.77263783,  74.01692503, 170.952427630, 313.23810451], $ 
;Neptune
     [30.06002276d, 0.00859048, 1.77004347, 131.78422574,  44.96476227, -55.12002969], $
;Pluto
     [39.48211675d, 0.24882730,17.14001206, 110.30393684, 224.06891629, 238.92903833] ]



translate CIE xyY values to their corresponding CIE Lab values.

All the neutral patches had the same xy values of .310 and .316.
It turns out that these values are neutral for the CIE Illuminant C.
More precisely, the values would be 0.310115 and 0.316312. 

Patch 	Name 	xyY 	Lab
1	dark skin	0.400	0.350	10.1	38.02	12.21	14.37
2	light skin	0.377	0.345	35.8	66.37	13.07	16.99
3	blue sky	0.247	0.251	19.3	51.04	0.36	-22.19
4	foliage	0.337	0.422	13.3	43.21	-16.87	21.96
5	blue flower	0.265	0.240	24.3	56.39	12.61	-25.49
6	bluish green	0.261	0.343	43.1	71.62	-30.59	1.14
7	orange	0.506	0.407	30.1	61.74	27.61	58.22
8	purpilish blue	0.211	0.175	12.0	41.22	17.61	-43.16
9	moderate red	0.453	0.306	19.8	51.61	42.91	14.73
10	purple	0.285	0.202	6.6	30.88	26.07	-23.50
11	yellow green	0.380	0.489	44.3	72.43	-28.41	59.48
12	orange yellow	0.473	0.438	43.1	71.62	12.37	67.05
13	blue	0.187	0.129	6.1	29.66	27.41	-51.15
14	green	0.305	0.478	23.4	55.48	-41.10	33.63
15	red	0.539	0.313	12.0	41.22	50.94	25.94
16	yellow	0.448	0.470	59.1	81.35	-3.92	79.11
17	magenta	0.364	0.233	19.8	51.61	48.96	-15.81
18	cyan	0.196	0.252	19.8	51.61	-21.65	-26.65
19	white	0.310	0.316	90.0	96.00	-0.0002	0.0002
20	neutral 8	0.310	0.316	59.1	81.35	-0.0002	0.0001
21	neutral 6.5	0.310	0.316	36.2	66.67	-0.0002	0.0001
22	neutral 5	0.310	0.316	19.8	51.61	-0.0001	0.0001
23	neutral 3.5	0.310	0.316	9.0	35.98	-0.0001	0.0001
24	black	0.310	0.316	3.1	20.44	-0.0001	0.0001




# An efficient algorithm for geocentric to geodetic coordinate conversion
# Ralph M. Toms, 13th Workshop on Standards for the Interoperability of Distributed Similations

!msgprefix Optimizing factor for geocentric to geodetic coordinate conversion (WGS84 Earth model) in
!msgpostfix  n
1.00260000   ? Region 1
1.00092592   ? Region 2
0.999250297  ? Region 3
0.997523508  ? Region 4


# Maximum error of 0.0006 radians (<3'), or if the final two terms
# are omitted, with a maximum error of 0.0035 radians (12').

# Variation in 1/r^2 throughout a year
# The maximum error is 0.0001

1.000110
0.034221
0.001280
0.000719
0.000077


# Equation of time
# 0.000075 in original paper should be 0.0000075
# See http://www.mail-archive.com/sundial@uni-koeln.de/msg01050.html
# The maximum error with this series is 0.0025 radians, equivalent to about
# 35 seconds of time.

 0.0000075
 0.001868
-0.032077
-0.014615
-0.040849


    Ellipsoid        Semi-Major Axis (m.)     1/Flattening
    ---------        -------------------     ---------------
    AIRY                 6377563.396         299.3249646
    AIRY-MODIFIED        6377340.189         299.3249646
    AUSTRALIAN           6378160.0           298.25
    BESSEL-1841          6377397.155         299.1528128
    CLARKE-1880          6378249.145         293.465
    EVEREST-1830         6377276.345         290.8017
    EVEREST-MODIFIED     6377304.063         290.8017
    FISHER-1960          6378166.0           298.3
    FISHER-1968          6378150.0           298.3
    GRS80                6378137.0           298.25722210088
    HOUGH-1956           6378270.0           297.0
    HAYFORD              6378388.0           297.0
    IAU76                6378140.0           298.257
    KRASSOVSKY-1938      6378245.0           298.3
    NAD27                6378206.4           294.9786982138
    NWL-9D               6378145.0           298.25
    SOUTHAMERICAN-1969   6378160.0           298.25
    SOVIET-1985          6378136.0           298.257
    WGS72                6378135.0           298.26
    WGS84                6378137.0           298.257223563

