... Printed in U.S.A. The Hipparcos and Tycho Photometric System Passbands MICHAEL S. BESSELL Research School of Astronomy and Astrophysics, Institute of Advanced Studies, The Australian National University, Private Bag, Weston Creek P.O., ACT 2611, Australia ; bessell=mso.anu.edu.au Received 2000 March 6 ; accepted 2000 April 17 ABSTRACT. Hipparcos and T ycho magnitudes have been extracted for many of the E-region standard stars. ... B [V regression for the E-region stars. ...

... Figure 1: The ds9 GUI . ... Menu bar . ... Display frame . ... Colorbar Setting and Saving View Preferences History Images Figure 1: The ds9 GUI Figure 2: The ds9 GUI, vertical layout Figure 3: Menu bar Figure 4: Tearing off a Menu Figure 5: Information panel Figure 6: Panner Figure 7: Magnifier Figure 8: Buttons Figure 9: Tiled frame display Figure 10: Colorbar Figure 11: Preferences dialog box The ds9 Interface This thread uses Chandra data from an observation of the Trapezium Cluster (ObsID 1522)...

... They discovered that Ptolemy's predictions of planetary movement (based on the so-called "wrong" geocentric theory) were in fact MORE ACCURATE than Copernicus'. ... I should also point out that Copernicus did not eliminate the epicycles from his heliocentric cosmos. ... He copied Ptolemy's theory and system almost exactly, with the exception of removing the equant point. Incidentally, it was Copernicus' denial of an equant point that destroyed the veracity of his predictions. ...