Milky Way

SkyViewer – displays HEALPix-based skymaps

SkyViewer is an OpenGL based program to display HEALPix-based skymaps, saved in FITS format files.

The loaded skymaps can be viewed either on a 3D sphere or as a Mollweide projection. In either case, realtime panning and zooming are supported, along with rotations for the 3D sphere view, assuming you have a strong enough graphics card.

This is free and open source software.

Key Features

  • Real time rotation, zooming, and panning of map.
  • Choice of 3D sphere or 2D Mollweide display.
  • Pixel texture aligns with HEALPix pixel boundaries.
  • Select pixel and get information for the pixel.
  • Adjustable mapping from pixel value to color.
  • View Temperature, Polarization or Nobs fields.
  • View polarization direction vectors.
  • Save screen shots to image file.
  • Contextual help.
  • Cross-platform support – runs under Linux, macOS, and Windows.

Website: lambda.gsfc.nasa.gov
Support: GitHub Code Repository
Developer: National Aeronautics and Space Administration
License: BSD License

Skyviewer in action
Click image for full size

SkyViewer is written in C++. Learn C++ with our recommended free books and free tutorials.


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Digital Universe AtlasStandalone 4-dimensional space visualization application
XEphemMotif based ephemeris and planetarium program
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Cosmonium3D astronomy and space exploration program
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AstraObservatory control system
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SkyviewerDisplays HEALPix-based skymaps
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ORSAFramework for celestial mechanics investigations

Read our verdict in the software roundup.


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