I then imported all these pictures into Hugin, another great free software that helps stitching panoramas. Some years ago, the process was long and painful, filled with control points settings, corrections and this kind of things. Nowadays, you can launch Hugin, click Load images…, select them, click Align…, wait, and click Create Panorama…, and wait. This thing just rocks and does everything by itself. Here’s the Fast Panorama Preview window that Hugin opens after you click on Align, showing the result of its calculations. Most likely, you can just close that window and proceed with Create Panorama. Now that you have a 100MB TIF file containing your 360° equirectangular panorama, you can open it with the Gimp to fix some of the details that Stellarium wants right. First, make sure that the image ratio is 2/1, and that both dimensions are a power of 2. (4096 pixels wide by 2048 high, for example). The ratio is for the panorama to look right, and the power of 2 is an OpenGL rendering requisite. Last but not least as you’ll want to see stars in the sky, you have to remove the sky from your panorama. The best is to take the picture with a clear sky so that the sky’s colour is homogeneous.
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