Illustrates the phenomenon known as the aberration of starlight. Stellar Aberration 3D Model illustrates the phenomenon known as the aberration of starlight, first reported by James Bradley in 1729. Aberration occurs because light has a finite speed, and thus light from a star takes a finite amount of time to travel through the tube of a telescope. During this time, the telescope moves as a result of Earth's rotational and orbital motions (in this case, the orbital motion is more important because it is faster). Therefore, if the telescope is pointed directly at the star the starlight will hit the sides of the tube before reaching the eyepiece. To see the star the telescope must be pointed forward (ie in the direction of Earth's motion) very slightly. As a result the apparent location of the star on the sky is different from its true location.

Controls
1. Play/Pause: start and stop the simulation.
2. Reset: reset the simulation to its initial state.
3. Clear traces: clear all traces in Space and Sky Views.
4. Time: time of year (in years) beginning at the vernal equinox.
5. Speed: speed of Earth's orbital motion divided by speed of light.
6. RA: true right ascension of the star.
7. Dec: true declination of the star.

Requirements:
* Java

The license of this software is Free, you can free download and free use this calculator software.