What You

All astronomical telescopes produce an image that is both upside-down and reversed from left to right. This is a natural consequence of the laws of optics. For everyday viewing, such as with binoculars and terrestrial spotting scopes, an extra lens is introduced in the eyepiece to turn the image the right way around again. However, this extra lens adds to the overall expense and absorbs some light. For astronomical purposes, it is unnecessary and so is omitted. This is the reason why many astronomical pictures have south at the top.

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