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The General Catalog of 1937. Advances in positional astronomy. Nicolaus Copernicus devised the first comprehensive heliocentric model. Copernicus’s heliocentric (Sun-centered) theory simplified the general explanation of planetary motions

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the general catalog of 1937

The General Catalog of 1937

Advances in positional astronomy

nicolaus copernicus devised the first comprehensive heliocentric model
Nicolaus Copernicus devised the first comprehensive heliocentric model
  • Copernicus’s heliocentric (Sun-centered) theory simplified the general explanation of planetary motions
  • In a heliocentric system, the Earth is one of the planets orbiting the Sun
  • The sidereal period of a planet, its true orbital period, is measured with respect to the stars

1473-1543

johannes kepler proposed elliptical paths for the planets about the sun
Johannes Kepler proposed elliptical pathsfor the planets about the Sun

Using data collected by Tycho Brahe from 1576 to 1597, Kepler deduced three laws of planetary motion:

  • the orbits are ellipses with the Sun at one focus;
  • a planet’s speed varies as it moves around its elliptical orbit;
  • the orbital period of a planet is related to the size of its orbit.

1571-1630

galileo s discoveries with a telescope strongly supported a heliocentric model
Galileo’s discoveries with a telescope stronglysupported a heliocentric model
  • The invention of the telescope led Galileo to new discoveries that supported a heliocentric model
  • These included his observations of the phases of Venus and of the motions of four moons around Jupiter

1564-1642

benjamin boss 1880 1970
Benjamin Boss (1880-1970)

General Catalogue of 33342 stars (GC) (Boss 1937)

astrographic catalogs
Astrographic Catalogs

Zone Information

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hipparcos space mission1
HIPPARCOS Space Mission
  • Measured parallaxes for about 118,000 stars
  • Accuracy to about 0.001” for brighter ones
  • Accurate distances to about 100 pc
  • Distances and other data give valuable astrophysical information on most types of stars