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
Central Churchmanship which are perceived as being extreme by Central Churchmen. F. A. Iremonger places William Temple among this group emphasizing that Temple had a firm hold on the articles of the historic creeds and a conviction that what is best in each school of thought within the Church is worth conserving. Perhaps the best known exponent of the Central Churchman position in the twentieth century was Geoffrey Francis Fisher, Archbishop of Canterbury from 1945 to 1961. Many other well-known English bishops, including Robert Stopford, Henry Montgomery Campbell, and Mervyn Haigh also favoured a Central Churchmanship approach, as a way of defusing