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North Polar sequence

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  • North polar sequence — The North polar sequence is a group of 96 stars that was used to define stellar magnitudes and colors. The cluster of stars lies within two degrees of the Northern Celestial pole, which makes them visible to everyone on the northern hemisphere.… …   Wikipedia

  • north polar sequence — ▪ astronomy       group of 96 stars near the north celestial pole, used from about 1900 to 1950 as standards of magnitude and colour by which other stars are measured. First proposed by the American astronomer Edward Charles Pickering (Pickering …   Universalium

  • North Pole — For other uses, see North Pole (disambiguation). Coordinates: 90°N 0°W / 90°N 0°W / 90; 0 …   Wikipedia

  • North American river otter — Conservation status Least Concern …   Wikipedia

  • Mars Polar Lander — Artist depiction of Mars Polar Lander on Mars. Operator NASA / JPL Major contractors Martin Marietta …   Wikipedia

  • List of birds of North Carolina — The Northern Cardinal is the state bird of North Carolina. In the state of North Carolina, 469 species of birds have been recorded.[1] This number includes the bird species that have been sighted in North Carolina and are believed to be of wild o …   Wikipedia

  • Zuñi sequence — The Zuñi sequence was the major cratonic sequence after the Absaroka sequence that began in the latest Jurassic, peaked in the late Cretaceous, and ended by the start of the following Paleocene. [Stanley, Steven M. Earth System History. p. 175]… …   Wikipedia

  • List of North Carolina birds — This list of North Carolina birds is a comprehensive listing of all the bird species recorded from the U.S. state of North Carolina. This list is based on a checklist used by the North Carolina Bird Records Committee, the list used by most… …   Wikipedia

  • List of astronomy acronyms — This is a compilation of acronyms commonly used in astronomy. Most of the acronyms are drawn from professional astronomy and are used quite frequently in scientific publications. However, a few of these acronyms are frequently used by the general …   Wikipedia

  • Leavitt , Henrietta Swan — (1868–1921) American astronomer Henrietta Leavitt was born the daughter of a Congregational minister in Lancaster, Massachusetts. Her interest in astronomy was aroused while she was at Radcliffe College (then the Society for the Collegiate… …   Scientists

  • Leavitt, Henrietta Swan — ▪ American astronomer born July 4, 1868, Lancaster, Mass., U.S. died Dec. 12, 1921, Cambridge, Mass.       American astronomer known for her discovery of the relationship between period and luminosity in Cepheid variables (Cepheid variable),… …   Universalium


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