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  Precession & Proper MotionApplet


Input fields: green

Use TAB key to get the next input field.

input right ascension declination
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).

example Meeus 

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