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  2. Magnitude (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Magnitude_(astronomy)

    An illustration of light sources from magnitude 1 to 3.5, in 0.5 increments. In astronomy, magnitude is a measure of the brightness of an object, usually in a defined passband. An imprecise but systematic determination of the magnitude of objects was introduced in ancient times by Hipparchus. Magnitude values do not have a unit.

  3. Celestial cartography - Wikipedia

    en.wikipedia.org/wiki/Celestial_cartography

    Download QR code; Print/export ... Wil Tirion charts (stars to magnitude 7.5) SkyGX ... "Astronomy: Selected Images, a collection of high-resolution star map images.

  4. List of common astronomy symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_common_astronomy...

    Download QR code; Print/export ... This is a compilation of symbols commonly used in astronomy, particularly professional astronomy. ... - Absolute magnitude, ...

  5. Star chart - Wikipedia

    en.wikipedia.org/wiki/Star_chart

    Sky ChartFree Northern Sky Chart Cutout. Planispherium – Free Northern Sky Chart Cutout in Latin; SFA Star ChartsFree star charts; Geody Star ChartsFree (CC-by-sa) printer friendly star charts for several latitudes and times of the year; An online star chart; Monthly sky maps for every location on Earth Archived 2007-09-13 at ...

  6. Apparent magnitude - Wikipedia

    en.wikipedia.org/wiki/Apparent_magnitude

    The absolute magnitude M, of a star or astronomical object is defined as the apparent magnitude it would have as seen from a distance of 10 parsecs (33 ly). The absolute magnitude of the Sun is 4.83 in the V band (visual), 4.68 in the Gaia satellite's G band (green) and 5.48 in the B band (blue).

  7. Henry Draper Catalogue - Wikipedia

    en.wikipedia.org/wiki/Henry_Draper_Catalogue

    The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts ...

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