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Precession & Proper MotionApplet Input fields: green Use TAB key to get the next input field. Insert space to separate hexadecimal input! Algorithm from J. Meeus ("Astronomical Algorithms", Chapter 20: Precession) The current standard epoque is "J2000" (2000, Jan 1 at 12 h TD), corresponding to JD 2 451 545.0. For purposes of calculating positions of stars, the beginning of a "year" differs from the standard epoque J2000.0 by an integer multiple of the Julian year (365.25 days).   Precession and Proper Motion Applet Web Links Links tested 2004, Sep 20 Bonner Durchmusterung Sky Eye Images from Digital Sky Survey DIRA2  Database of astronomical catalogues View of the Hipparcos and Tycho stars (Sky Plot java applet) Astronomical Catalogs (Munic Astro Archive) The 150 Stars in the Hipparcos Catalogue with Largest Transverse Velocities The 150 Stars in the Hipparcos Catalogue with Highest Apparent Magnitude The Bright Star Catalogue © 2003-2023 J. Giesen Updated: 2023,  Oct  06