Bibliografia

- Robin M. Green: "Spherical Astronomy", Cambridge University Press (CUP), 1985. - Christopher R. Kitchin: "Astrophysical Techniques", CRC Press 2008, (1ªed 1991). - Edwin Budding & Osman Demircan: "Introduction to Astronomical Photometry", CUP, 2007, "Cambridge Observing Handbooks for Research Astronomers" series, No. 6. - Christopher R. Kitchin: "Optical Astronomical Spectroscopy", Institute of Physics Publishing, 1996:
R. M. Green, Spherical Astronomy, (Cambridge University Press) 1985. C. R. Kitchin, Astrophysical Techniques, (CRC Press) 2008, (1ªed 1991). E. Budding and O. Demircan, Introduction to Astronomical Photometry, (CUP) 2007, Cambridge Observing Handbooks for Research Astronomers series, No. 6. C. R. Kitchin, Optical Astronomical Spectroscopy, (Institute of Physics Publishing) 1996:

- J. Meeus: "Astronomical Formulae for Calculators", Willmann-Bell, 1998. - P. Duffet-Smith, "Astronomy with your Personal Computer", 2ª ed, CUP, 1990. - W. M. Smart: "Textbook on Spherical Astronomy", 4ª ed, CUP, 1949. - Arne A. Henden, Ronald H. Kaitchuck: "Astronomical Photometry: a Text and Handbook for the advanced Amateur and Professional Astronomer", 1990, Willman-Bell. :
J. Meeus, Astronomical Formulae for Calculators, (Willmann-Bell) 1998. P. Duffet-Smith, Astronomy with your Personal Computer, 2ª ed (CUP) 1990. W. M. Smart, Textbook on Spherical Astronomy, 4ª ed (CUP) 1949. A. A. Henden, R. H. Kaitchuck, Astronomical Photometry: a Text and Handbook for the advanced Amateur and Professional Astronomer, (Willman-Bell) 1990. :