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 City, Nebraska school. In the 1950s, Nebraska Central College closed (1953) but a new hospital was built in 1959. In 1975, an explosion and fire destroyed an entire city block, but Central City still reached its largest population to date at 3,083 people in 1980. Central City's population has declined slightly since then. Six places in or near Central City are listed in the National Register of Historic Places. To qualify for listing in the National Register of Historic Places, a place (e.g., building, landmark, or location) must be at least 50 years old and have one or more of the following