The applet TLPSHorizon listens to the Observer and the Calendar (TimeBase) applet. When changing the epoch or the observer TLPSHorizon is going to show the new positions. Remember that time and date in the Calendar applet (TimeBase) represent UTC.
Pluto's orbit is determined by osculating orbital elements of July 11, 1997.
The stellar positions are taken from FK5 (Fundamental Katalog No. 5). FK5 contains 1535 stars originally chosen for high precision astrometry. To complete some of the constellations a few stars have been added from a different source ("The Guinness Book of Astronomy").
Drag the mouse to the right or to the left border to get another viewing direction along the horizon. Drag it to the top to see the zenith region or drag it to the bottom to lower the vertical viewing direction. You may even have a slight look below the horizon (green line) to get an impression which stars or planets are going to rise or have just been setting.
Click into the small area in the upper left to decrease the stars' magnitude or click into the upper right region to increase the magnitude of stars being drawn.
Enter the longitude (eastwards
positive) and the latitude (northwards positive) of your location on Earth and/or change the date and time to see the stars and planets wander around.
Dieter Egger, last update 2002-02-27