A "God's view" map of Milky Way as seen from far Galactic North (in Coma Berenices). The star-like lines center in a yellow dot representing the position of Sun. The spokes of that "star" are marked with constellation abbreviations, "Cas" for "Cassiopeia", etc. The spiral arms are colored differently in order to highlight what structure belongs to which arm. H II regions are marked as dots colored in the same color as their spiral arm. They come in three sizes, measured by the
excitation parameter
U:
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Method
The original image,
Image:Milky Way Arms-Hypothetical.png
, was dloaded and rotated by gimp, so that Sun is
up
, as is custom on Milky Way "God's view" maps. The image is then saved and imported into inkscape, and used as a template for vector editing by hand. Thereafter added:
a.
30° sectors around Sun, named for constellation in that direction in the galactic plane,
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