Timeline of electromagnetism and classical optics
Timeline of electromagnetism and classical optics lists, within the history of electromagnetism, the associated theories, technology, and events.
Detail of the right-hand facade fresco, showing Thales of Miletus, National and Kapodistrian University of Athens.
Girolamo Cardano, De subtilitate
Albert Einstein in the patent office, Bern Switzerland, 1905
In astronomy, aberration is a phenomenon where celestial objects exhibit an apparent motion about their true positions based on the velocity of the observer: It causes objects to appear to be displaced towards the observer's direction of motion. The change in angle is of the order of where is the speed of light and the velocity of the observer. In the case of "stellar" or "annual" aberration, the apparent position of a star to an observer on Earth varies periodically over the course of a year as the Earth's velocity changes as it revolves around the Sun, by a maximum angle of approximately 20 arcseconds in right ascension or declination.
Bradley's observations of γ Draconis and 35 Camelopardalis as reduced by Busch to the year 1730.
Hypothetical observation of γ Draconis if its movement was caused by parallax.
Hypothetical observation of γ Draconis and 35 Camelopardalis if their movements were caused by nutation.
Figure 2: As light propagates down the telescope, the telescope moves requiring a tilt to the telescope that depends on the speed of light. The apparent angle of the star φ differs from its true angle θ.
