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
Places in Virginia with names involving "Dale" from Glen Dale Farm, which as so named by Hannah Jane Cockayne, née Alexander. It is known she was 20 or 21 at the time of West Virginia's secession, and that she married the owner in 1863, so even "Glen Dale Farm, Virginia" may be an anachronistic term. It is clear that what is now the city of Glen Dale was "never" a city while its location lay in Virginia. The remaining Dale/-dale-named West Virginia places are: Places in Virginia with names involving "Dale" The term or name Dale appears in a number of place names in the American state