README   README 
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1.2 The skylight class 1.2 The skylight class
The class is a fast implementation of the algorithm from the The class is a fast implementation of the algorithm from the
article "A Practical Analytic Model for Daylight" by A. J. article "A Practical Analytic Model for Daylight" by A. J.
Preetham, Peter Shirley and Brian Smits. Preetham, Peter Shirley and Brian Smits.
1.3 The skybright class 1.3 The skybright class
The class is a fast reimplementation of the VISLIMIT.BAS bas ic The class is a fast reimplementation of the VISLIMIT.BAS bas ic
source code from Brad Schaefer's article on pages 57-60, Ma y source code from Brad Schaefer's article on pages 57-60, Ma y
1998 _Sky & Telescope_, "To the Visual Limits". The basic 1998 _Sky & Telescope_, "To the Visual Limits". The basic
sources are available on the Sky and Telescope web site. sources are available on the Sky and Telescope web site.
(code "offered as-is and without support.") (code "offered as-is and without support.")
1.4 The Delta-T calculations
For implementation of calculate values of Delta-T we used ne
xt sources:
[1] Delta-T webpage by Rob van Gent: http://www.staff.scienc
e.uu.nl/~gent0113/deltat/deltat.htm
[2] "Five Millennium Canon of Solar Eclipses", Espenak and M
eeus
http://eclipse.gsfc.nasa.gov/SEhelp/deltatpoly2004.html
[3] "On the system of astronomical constants", Clemence, G.
M.,
Astronomical Journal, Vol. 53, p. 169
http://adsabs.harvard.edu/abs/1948AJ.....53..169C
[4] "The Rotation of the Earth, and the Secular Acceleration
s of the Sun, Moon and Planets",
Spencer Jones, Monthly Notices of the Royal Astronomical
Society, 99 (1939), 541-558
http://adsabs.harvard.edu/abs/1939MNRAS..99..541S
[5] "Polynomial approximations for the correction delta T E.
T.-U.T. in the period 1800-1975",
Schmadel, L. D.; Zech, G., Acta Astronomica, vol. 29, no
. 1, 1979, p. 101-104.
http://adsabs.harvard.edu/abs/1979AcA....29..101S
[6] "ELP 2000-85 and the dynamic time-universal time relatio
n", Borkowski, K. M.,
Astronomy and Astrophysics (ISSN 0004-6361), vol. 205, n
o. 1-2, Oct. 1988, p. L8-L10.
http://adsabs.harvard.edu/abs/1988A&A...205L...8B
[7] "Empirical Transformations from U.T. to E.T. for the Per
iod 1800-1988",
Schmadel, L. D.; Zech, G., Astronomische Nachrichten 309
, 219-221
http://adsabs.harvard.edu/abs/1988AN....309..219S
[8] "Historical values of the Earth's clock error DeltaT and
the calculation of eclipses",
Morrison, L. V.; Stephenson, F. R., Journal for the Hist
ory of Astronomy (ISSN 0021-8286),
Vol. 35, Part 3, No. 120, p. 327 - 336 (2004)
http://adsabs.harvard.edu/abs/2004JHA....35..327M
[9] "Addendum: Historical values of the Earth's clock error"
, Morrison, L. V.; Stephenson, F. R.,
Journal for the History of Astronomy (ISSN 0021-8286), V
ol. 36, Part 3, No. 124, p. 339 (2005)
http://adsabs.harvard.edu/abs/2005JHA....36..339M
[10] "Polynomial approximations to Delta T, 1620-2000 AD", M
eeus, J.; Simons, L.,
Journal of the British Astronomical Association, vol.110
, no.6, 323
http://adsabs.harvard.edu/abs/2000JBAA..110..323M
[11] "Einstein's Theory of Relativity Confirmed by Ancient S
olar Eclipses", Henriksson G.,
http://adsabs.harvard.edu/abs/2009ASPC..409..166H
[12] "Canon of Solar Eclipses" by Mucke & Meeus (1983)
[13] "The accelerations of the earth and moon from early ast
ronomical observations",
Muller P. M., Stephenson F. R.,
http://adsabs.harvard.edu/abs/1975grhe.conf..459M
[14] "Pre-Telescopic Astronomical Observations", Stephenson
F. R.,
http://adsabs.harvard.edu/abs/1978tfer.conf....5S
[15] "Long-term changes in the rotation of the earth - 700 B
.C. to A.D. 1980",
Stephenson F. R., Morrison L. V.,
Philosophical Transactions, Series A (ISSN 0080-4614),
vol. 313, no. 1524, Nov. 27, 1984, p. 47-70.
http://adsabs.harvard.edu/abs/1984RSPTA.313...47S
[16] "Long-Term Fluctuations in the Earth's Rotation: 700 BC
to AD 1990",
Stephenson F. R., Morrison L. V.,
Philosophical Transactions: Physical Sciences and Engine
ering, Volume 351, Issue 1695, pp. 165-202
http://adsabs.harvard.edu/abs/1995RSPTA.351..165S
[17] "Historical Eclipses and Earth's Rotation" by F. R. Ste
phenson (1997)
http://ebooks.cambridge.org/ebook.jsf?bid=CBO97805115251
86
[18] "Astronomical Algorithms" by J. Meeus (2nd ed., 1998)
[19] "Astronomy on the Personal Computer" by O. Montenbruck
& T. Pfleger (4nd ed., 2000)
[20] "Calendrical Calculations" by E. M. Reingold & N. Dersh
owitz (2nd ed., 2001)
[21] DeltaT webpage by V. Reijs: http://www.iol.ie/~geniet/e
ng/DeltaTeval.htm
2. Included source code 2. Included source code
2.1 Some computation of the sideral time (sideral_time.h/c) and plut o 2.1 Some computation of the sideral time (sideral_time.h/c) and plut o
orbit contains code from the libnova library (LGPL) by Liam Girdwoo d. orbit contains code from the libnova library (LGPL) by Liam Girdwood.
2.2 The orbit.cpp/h and solve.h files are directly borrowed from 2.2 The orbit.cpp/h and solve.h files are directly borrowed from
Celestia (Chris Laurel). (GPL license) Celestia (Chris Laurel). (GPL license)
2.3 Several implementations of IMCCE theories for planet and satelli te 2.3 Several implementations of IMCCE theories for planet and satelli te
movement by Johannes Gajdosik (MIT-style license, movement by Johannes Gajdosik (MIT-style license,
see the corresponding files for the license text) see the corresponding files for the license text)
2.4 The tesselation algorithms were originally extracted from the glues 2.4 The tesselation algorithms were originally extracted from the gl
library version 1.4 Mike Gorchak <mike@malva.ua> (SGI FREE SOFTWARE ues
LICENSE B). library version 1.4 Mike Gorchak <mike@malva.ua> (SGI FREE S
OFTWARE
LICENSE B).
3. Data 3. Data
3.1 The Hipparcos star catalog 3.1 The Hipparcos star catalog
From ESA (European Space Agency) and the Hipparcos mission. From ESA (European Space Agency) and the Hipparcos mission.
ref. ESA, 1997, The Hipparcos and Tycho Catalogues, ESA SP-1 200 ref. ESA, 1997, The Hipparcos and Tycho Catalogues, ESA SP-1 200
http://cdsweb.u-strasbg.fr/ftp/cats/I/239 http://cdsweb.u-strasbg.fr/ftp/cats/I/239
3.2 The solar system data mainly comes from IMCCE and partly from 3.2 The solar system data mainly comes from IMCCE and partly from
Celestia. Celestia.
3.3 Polynesian constellations are based on diagrams from the Polynes ian 3.3 Polynesian constellations are based on diagrams from the Polynes ian
Voyaging Society Voyaging Society
skipping to change at line 253 skipping to change at line 305
if proper credit to the original image is given." if proper credit to the original image is given."
4.7 All messiers nebula pictures except those mentioned below from t he 4.7 All messiers nebula pictures except those mentioned below from t he
Grasslands Observatory : "Images courtesy of Tim Hunter and Grasslands Observatory : "Images courtesy of Tim Hunter and
James McGaha, Grasslands Observatory at http://www.3towers.c om." James McGaha, Grasslands Observatory at http://www.3towers.c om."
License: permission given to "use the image freely" (includi ng License: permission given to "use the image freely" (includi ng
right to modify and redistribute) "as long as it is credited ." right to modify and redistribute) "as long as it is credited ."
4.8 M31, and the Pleiades pictures come from Herm Perez : 4.8 M31, and the Pleiades pictures come from Herm Perez :
http://home.att.net/~hermperez/default.htm http://home.att.net/~hermperez/default.htm
License: "Feel free to use these images, if you use them in a License: "Feel free to use these images, if you use them in a
commercial setting please attribute the source." commercial setting please attribute the source."
4.9 Images of M8, M20, M33, NGC253, NGC1499, NGC2244, IC343 from 4.9 Images of M8, M33, NGC253, NGC1499, NGC2244, IC343 from
Jean-Pierre Bousquet Jean-Pierre Bousquet
4.10 Images of M1, M15, M16, M27, M42, M57, M97, NGC6946 from Stepha ne Dumont 4.10 Images of M1, M15, M16, M27, M42, M57, M97, NGC6946 from Stepha ne Dumont
4.11 Images of M17, M44, NGC856, NGC884 from Maxime Spano 4.11 Images of M17, M44, NGC856, NGC884 from Maxime Spano
4.12 Constellation art, GUI buttons, logo created by Johan Meuris 4.12 Constellation art, GUI buttons, logo created by Johan Meuris
(Jomejome) (jomejome at users.sourceforge.net) (Jomejome) (jomejome at users.sourceforge.net)
http://www.johanmeuris.eu/ http://www.johanmeuris.eu/
License: released under the Free Art License License: released under the Free Art License
(http://artlibre.org/licence.php/lalgb.html) (http://artlibre.org/licence.php/lalgb.html)
Icon created by Johan Meuris Icon created by Johan Meuris
License: Creative Commons Attribution-ShareAlike 3.0 Unporte d License: Creative Commons Attribution-ShareAlike 3.0 Unporte d
4.13 The "earth-clouds" texture includes imagery owned by NASA. 4.13 The "earth-clouds" texture includes imagery owned by NASA.
See NASA's Visible Earth project at http://visibleearth.nasa .gov/ See NASA's Visible Earth project at http://visibleearth.nasa .gov/
License: 1. The imagery is free of licensing fees License: 1. The imagery is free of licensing fees
2. NASA requires that they be provided a credit as the owners 2. NASA requires that they be provided a credit as the owners
of the imagery of the imagery
The cloud texturing was taken from Celestia (GPL), The cloud texturing was taken from Celestia (GPL),
http://www.shatters.net/celestia/ http://www.shatters.net/celestia/
4.14 The folder icon derived from the Tango Desktop Project, used un der 4.14 The folder icon derived from the Tango Desktop Project, used un der
the terms of the Creative Commons Attribution Share-Alike the terms of the Creative Commons Attribution Share-Alike
license. license.
4.15 Images of NGC104, NGC281, NGC5139, NGC6543, NGC6960, NGC7023, N 4.15 Images of NGC281, NGC5139, NGC6543, NGC6960, NGC7023, NGC7317,
GC7317, NGC7318,
NGC7318, NGC7319, NGC7320, NGC7331, IC4592 NGC7319, NGC7320, NGC7331, IC4601, IC4592
from Andrey Kuznetsov, Kepler Observatory from Andrey Kuznetsov, Kepler Observatory
http://kepler-observatorium.ru http://kepler-observatorium.ru
License: Creative Commons Attribution 3.0 Unported License: Creative Commons Attribution 3.0 Unported
4.16 Images of NGC891, NGC1333, NGC2903, NGC3185, NGC3187, NGC3189, NGC3190, 4.16 Images of NGC891, NGC1333, NGC2903, NGC3185, NGC3187, NGC3189, NGC3190,
NGC3193, NGC3718, NGC3729, NGC4490, NGC5981, NGC5982, NGC598 5, NGC7129 NGC3193, NGC3718, NGC3729, NGC4490, NGC5981, NGC5982, NGC598 5, NGC7129
from Oleg Bryzgalov from Oleg Bryzgalov
http://olegbr.astroclub.kiev.ua/ http://olegbr.astroclub.kiev.ua/
License: Creative Commons Attribution 3.0 Unported License: Creative Commons Attribution 3.0 Unported
4.17 Image of eta Carinae
from Georg Zotti
http://www.waa.at/
License: Creative Commons Attribution 3.0 Unported
4.18 Images of IC1805, IC1848, NGC6888
from Steve Tuttle
http://www.stuttle1.com/
4.19 Images of IC2944, IC4628, M20, M21, M47
from Trevor Gerdes
http://sarcasmogerdes.dyndns.org/
4.20 Images of IC2118, NGC1532
from users of Ice In Space
http://www.iceinspace.com.au/
4.21 Image of IC5146 from James A Weier
4.22 Images of SMC, LMC (Magellanic Clouds) and rho Oph from Albert
Van Donkelaar
4.23 Images of NGC55, NGC300, NGC1365, NGC3628, NGC4945, NGC5128, NG
C6726,
NGC6744, NGC6752, NGC6822, NGC7293
from Philip Montgomery
http://www.kenthurst.bigpondhosting.com/
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9. LICENSE 9. LICENSE
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Copyright (C) 2004-2012 Fabien Chereau et al. Copyright (C) 2004-2012 Fabien Chereau et al.
This program is free software; you can redistribute it and/or This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2 as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version. of the License, or (at your option) any later version.
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