Timeline of astronomy Rectification of Planetary Theory", eliminated the need for an equant by introducing an extra epicycle, departing from the Ptolemaic system in a way very similar to what Copernicus later also did. Ibn al-Shatir proposed a system that was only approximately geocentric, rather than exactly so, having demonstrated trigonometrically that the Earth was not the exact center of the universe. His rectification is later used in the Copernican model. Nicolaus Copernicus publishes "De revolutionibus orbium coelestium" containing his theory that Earth travels around the Sun. However, he complicates his theory by retaining Plato's perfect circular orbits of the planets. A brilliant
Admiralty in the 16th century with salvage claims for wrecks, acting as a judge in relation to maritime issues. The Vice Admiralty Court was a prerogative court established in the early 16th. A vice-admiralty court is in effect an admiralty court. The word “vice” in the name of the court denoted that the court represented the Lord Admiral of the United Kingdom. In English legal theory, the Lord Admiral, as vice-regal of the monarch, was the only person who had authority over matters relating to the sea. the holder of the post Vice-Admiral of the Coast was responsible for the defence of one of the