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- Q4412390 subject Q9268796.
- Q4412390 abstract "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.Originally proposed by Edward Charles Pickering, the system was used between 1900 and 1950. Today it has been replaced by the UBV photometric system.".
- Q4412390 wikiPageExternalLink books?id=tZpQR_nYKeYC&pg=PA446.
- Q4412390 wikiPageExternalLink north-polar-sequence.html.
- Q4412390 wikiPageWikiLink Q12119.
- Q4412390 wikiPageWikiLink Q124313.
- Q4412390 wikiPageWikiLink Q129833.
- Q4412390 wikiPageWikiLink Q156896.
- Q4412390 wikiPageWikiLink Q179600.
- Q4412390 wikiPageWikiLink Q39061.
- Q4412390 wikiPageWikiLink Q9268796.
- Q4412390 wikiPageWikiLink Q948944.
- Q4412390 comment "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.Originally proposed by Edward Charles Pickering, the system was used between 1900 and 1950. Today it has been replaced by the UBV photometric system.".
- Q4412390 label "North polar sequence".