... 4NS1
Now at MPI für Sonnensystemforschung,D-37077 Göttingen,Germany 
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... purposes2
The American National Space Science Data Center(NSSDC) maintains a webpage at http://nssdc.gsfc.nasa.gov/space/helios/plan_des.html 
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...A.3
See the Nautical Almanac Offices webpage for details:
http://www.usno.navy.mil/and http://astro.ukho.gov.uk/ 
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...standish:R984
JPL Horizons System and DE200 at http://ssd.jpl.nasa.gov/ 
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...bretagnon:885
Data are available at the Institut de Mecanique Celeste at https://www.imcce.fr/ 
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... system6
JPL SPICE at https://naif.jpl.nasa.gov/ 
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... website7
http://www2.mps.mpg.de/homes/fraenz/systems/ 
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... UT1)8
For the difference see table at http://maia.usno.navy.mil/ 
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... table]9
See also the webpage of the International Earth Rotation Service (IERS) at https://www.iers.org/ 
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... .3.222.1-3.224.2]10
Note that there is a typographic error in the mean lunar ascending longitude in [S. Tab.3.222.2], the first argument should read $\Omega=125^\circ02'40''.280$. 
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...hapgood:9711
See also their webpage at http://www.mssl.ucl.ac.uk/grid/iau/extra/local_copy/SP_coords/ct_home.htm 
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... systems12
ESA SPENVIS webpage at http://www.spenvis.oma.be/ 
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... Plasmas13
See under MAGLIB at http://cdpp.eu 
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... 814
See their webpage at http://www.ngdc.noaa.gov/IAGA/vmod/ 
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... (Russell and Elphic, 1978)15
See also C.T. Russell's page at http://www-ssc.igpp.ucla.edu/ssc/tutorial/magnetopause.html 
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... coordinates16
See also the APL Supermag webpage http://supermag.jhuapl.edu/ 
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... 17
See also the University of Oulu spaceweb at http://www.oulu.fi/physics/space-physics/ 
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... 18
See also S. Haaland's page at ( not maintained) http://gluon.fi.uib.no/ haaland/ 
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...)19
See also the NSSDC Modelweb at https://omniweb.gsfc.nasa.gov/vitmo/ 
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... subject20
For example K.Burnett's site at http://www.stargazing.net/kepler/ 
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... NSSDC21
NSSDC at https://sscweb.gsfc.nasa.gov/ 
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... page22
Voyager at http://voyager.jpl.nasa.gov/science/hyperbolic.html 
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... page23
Ulysses at https://www.cosmos.esa.int/web/ulysses/orbital-elements 
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... website24
http://www.space-plasma.qmul.ac.uk/heliocoords/ 
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