Geocentric model explanation in terms of the Earth's revolution about the sun. In 1838, astronomer Friedrich Wilhelm Bessel measured the parallax of the star 61 Cygni successfully, and disproved Ptolemy's claim that parallax motion did not exist. This finally confirmed the assumptions made by Copernicus, providing accurate, dependable scientific observations, and conclusively displaying how distant stars are from Earth. A geocentric frame is useful for many everyday activities and most laboratory experiments, but is a less appropriate choice for solar system mechanics and space travel. While a heliocentric frame is most useful in those cases, galactic and extragalactic astronomy is easier if
Second term of Edmund Ho as Chief Executive of Macau Second term of Edmund Ho as Chief Executive of Macau The Second term of Edmund Ho Hau Wah as Chief Executive of Macau, officially considered part of "The 2nd term Chief Executive of Macau", relates to the period of governance of Macau since the transfer of sovereignty of Macau, between 20 December 2004 and 20 December 2009. Edmund Ho Hau Wah was reelected in mid 2004 by 300-member Selection Committee. The policy bureaux were under several reorganisations during the term as following: The Executive Council was presided by President Edmund Ho Hau Wah and consisted of total 10 members. All