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
The Tunnel Thru the Air; Or, Looking Back from 1940 found that in March–April 1924, geocentric Jupiter was at max South declination, and geocentric Uranus in South declination during all of 1924. On July 8, 1927 geocentric Jupiter was at 0 North declination, and on May 1, 1927, geocentric Uranus was at 0 North declination. The declination of both planets was “increasing” during the 1924-1927 bull market. The Tunnel Thru the Air; Or, Looking Back from 1940 The Tunnel Thru the Air, Or, Looking Back from 1940 is a science fiction novel written by market forecaster William Delbert Gann in 1927. In the Foreword, Gann hinted that this book is