Email: nexusmail at this Web site address
I have used data from many sources. The most important are given here. Many of the catalogs were downloaded or used online from NASA's Astronomical Data Center (ADC), at http://adc.gsfc.nasa.gov.
I used the free ray-tracing program POV-Ray to create the foreground (islands + ocean) for the opening scene in the Encyclopedia site.
European Space Agency, Hipparcos Catalogue (1997)
All position (right ascension, declination and distance) data were taken from Hipparcos unless otherwise noted. Yale Bright Star (HR) numbers were taken from the Bright Star Catalogue and the Gliese numbers from the Catalogue of Nearby Stars.
Apparent magnitudes are from Hipparcos, except in the case of close double stars, which Hipparcos sometimes reported as a single star. In these cases, the magnitudes of the various components were taken from the Catalogue of Nearby Stars.
Spectral types are from Hipparcos, except for two stars (36 Oph and Gliese 666), where the Hipparcos values seemed erroneous. For these two stars the values from Catalogue of Nearby Stars were used instead.
Values from Cayrel de Strobel's catalog were preferred, when available. A metallicity of "Unknown" indicates missing data (unavailable in either catalog).
As with the metallicity data, a value of "Unknown" indicates missing spectroscopic data. Ca II data are, interestingly enough, most complete for highly Sunlike stars, as a result of SETI target selection, and are less complete for stars appreciably brighter or dimmer than the Sun.