References

 
• Atkinson, R. d'E. 1951, MNRAS, 111, 448 NASA ADS  
• Blaauw, A., Gum, C. S., Pawsey, J. L., & Westerhout, G. 1960, MNRAS, 121, 123 NASA ADS  
• Brouw, W. N. 1971, Ph.D. Thesis, Sterrenwacht, Leiden  
• Bunclark, P., & Rots, A. 1996, Precise Re-definition of DATE-OBS Keyword Encompassing the Millennium, located at
  http://www.cv.nrao.edu/fits/documents/standards/ as year2000.txt  
• Calabretta, M. R. 1992, Spherical Map Projections, AIPS++ Memo No. 107, The AIPS++ Consortium, c/o National Radio Astronomy Observatory, Charlottesville, Virginia, Dec 15.
  http://aips2.nrao.edu/docs/memos/107.ps  
• Calabretta, M. R. 1995, WCSLIB, version 2, located at ftp://ftp.atnf.csiro.au/pub/software/wcslib/wcs- lib.tar.gz  
• Calabretta, M. R., et al. 2002, Representations of distortions in FITS world coordinate systems, A&A, in preparation  
• Chan, F. K., & O'Neill, E. M. 1975, Feasibility Study of a Quadrilateralized Spherical Cube Earth Data Base, EPRF Technical Report 2 - 75 (CSC), Computer Sciences Corporation (Silver Springs, Maryland)  
• Cornwell, T. J., & Perley, R. A. 1992, A&A, 261, 353 NASA ADS  
• Cotton, W. D., Tody, D., & Pence, W. D. 1995, A&AS, 113, 159 NASA ADS  
• Evenden, G. I. 1991, Cartographic Projection Procedures for the UNIX Environment - A User's Manual, Open-File Report 90-284, United States Department of the Interior Geological Survey. Available as OF90-284.ps.gz at ftp://kai.er.usgs.gov/pub/PROJ.4/ with accompanying code and related documents. The documents are also cached at http://www.cv.nrao.edu/fits/wcs/USGS/  
• Górski, K. M., & Hivon, E. F. 1999, HEALPix homepage, located at http://www.eso.org/science/healpix  
• Geldzahler, B., & Schlesinger, B. M. 1997, A User's Guide for the Flexible Image Transport System (FITS), NASA/OSSA Office of Standards and Technology, Greenbelt, Maryland, version 4.0 (April 1997). Located via
  http://www.gsfc.nasa.gov/astro/fits/fits_home.html  
• Greisen, E. W. 1983, Non-linear Coordinate Systems in AIPS, AIPS Memo No. 27, National Radio Astronomy Observatory, Charlottesville, Virginia. Revised January 1993, located at http://www.cv.nrao.edu/fits/wcs/ as aips27.ps.Z  
• Greisen, E. W. 1986, Additional Non-linear Coordinates, AIPS Memo No. 46, National Radio Astronomy Observatory, Charlottesville, Virginia, May 20, available as aips46.ps.Z from http://www.cv.nrao.edu/fits/wcs/  
• Greisen, E. W., Valdes, F. G., Calabretta, M. R., & Allen, S. L. 2002, Representations of spectral coordinates in FITS, A&A, in preparation  
• Greisen, E. W., & Calabretta, M. R. 2002, A&A, 395, 1061 (Paper I)  
• Greisen, E. W., & Harten, R. H. 1981, A&AS, 44, 371 NASA ADS  
• Hanisch, R. J., & Wells, D. C. 1988, World Coordinate Systems Representations Within the FITS Format, draft based on notes from a meeting sponsored by the National Aeronautics and Space Administration, Code EZ, held in Charlottesville, Virginia in January 1988, located at http://www.cv.nrao.edu/fits/wcs/ as wcs88.ps.Z  
• Hanisch, R. J., Farris, A., Greisen, E. W., et al. 2001, A&A, 376, 359 NASA ADS  
• Hohenkerk, C. Y., Yallop, B. D., Smith, C. A., & Sinclair, A. T. 1992, Explanatory Supplement to the Astronomical Almanac, ed. P. K. Seidelmann, Chap. 3 (University Science Books, Mill Valley, California)  
• IAU, 1998, Proceedings of the Twenty-Third General Assembly, Kyoto 1997, Transactions of the IAU, vol. XXIII-B  
• Jones, M. H. 1993, Observatory, 113, 213 NASA ADS  
• Kellaway, G. P. 1946, Map Projections (Methuen & Co. Ltd., London, England)  
• O'Neill, E. M., & Laubscher, R. E. 1976, Extended Studies of the Quadrilateralized Spherical Cube Earth Data Base, NEPRF Technical Report 3 - 76 (CSC) Computer Sciences Corporation (Silver Springs, Maryland)  
• Schlegel, D. J., Finkbeiner, D. P., & Davis, M. 1998, ApJ, 500, 525 NASA ADS  
• Snyder, J. P. 1993, Flattening the Earth (University of Chicago Press, Chicago and London)  
• Tegmark, M. 1996, ApJ, 470, L81 NASA ADS  
• Thompson, A. R., Moran, J. W., & Swenson, G. W. 1986, Interferometry and Synthesis in Radio Astronomy (J. Wiley, New York, USA)  
• Thompson, W. 1999, Coordinate Systems for Solar Image Data (proposed). Located at http://orpheus.nascom.na- sa.gov/~thompson/papers/coordinates.ps  
• Wells, D. C., Greisen, E. W., & Harten, R. H. 1981, A&AS, 44, 363 NASA ADS