Geocentric model the coordinate system in order to predict the motions of planetary bodies, though doing so may make calculations easier to perform or interpret. A geocentric coordinate system can be more convenient when dealing only with bodies mostly influenced by the gravity of the Earth (such as artificial satellites and the Moon), or when calculating what the sky will look like when viewed from Earth (as opposed to an imaginary observer looking down on the entire solar system, where a different coordinate system might be more convenient). The Ptolemaic model of the solar system held sway into the early modern age;
First term of Fernando Chui as Chief Executive of Macau First term of Fernando Chui as Chief Executive of Macau The First term of Fernando Chui Sai On as Chief Executive of Macau, officially considered part of "The 3rd term Chief Executive of Macau", relates to the period of governance of Macau since the transfer of sovereignty of Macau, between 20 December 2009 and 20 December 2014. Fernando Chui Sai On was elected in mid 2009 by 300-member Selection Committee as the second Chief Executive of Macau. The policy bureaux were under several reorganisations during the term as following: The Executive Council was presided by President Fernando Chui Sai On