You know how a paper map of the Earth handles mapping the whole 3d sphere? This shape shown below covers the whole of our view of the sky.
Max Planck puts out some amazing sky maps, like this that they released recently of Polarized Dust "Our Milky Way galaxy is ablaze with dust..."
Awesome processing on this sunspot. "a speckle reconstruction based on 25 images selected from a burst of 50 at an exposure time of 20 ms. The filter is a Fabry-Perot with a bandpass of 0.08A and the camera is a PCOedge 2kx2k"
Credit:Big Bear Solar Observatory, NJ Institute of Technology, USA. Found via Spaceweather: Extra processing - Gabriel Corban