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 Philippine University Learning Center (Building), CPU Center for Local Governance and Indigenous Peoples Studies; CPU-World Bank Knowledge Development Center (CPU WB-KDC); CPU Appropriate Technology Center (CPU-APPROTECH); CPU Crop Research Laboratory; and the CPU – Social Science Research Institute. ""Central Spirit"" which has purportedly served as ""a social glue"", is a term for camaraderie, unity or reminisce the fond school day memories and activities at Central that has become symbolic of the bond that unites Centralians. "Central Spirit" is also contrast to what Central was founded for over a century before by the American missionaries and the school's vision. Moreover, there is also