A couple of years ago, I was very interested in stargazing. One important and useful lesson that I learned when carrying around large telescopes in very dark places, was that red light is your best friend. When you spend time in darkness, eventually your eyes will adjust their ability to see in darkness. If you are exposed to strong light from e.g., a flashlight, headlight or device screen, you will instantly overload your sensitive eyes and consequentially wait for a while until your eyes adjust themselves back. Needless to say, it is thus crucial to adapt your eyes when stargazing – and to keep them that way until you are done. But how to orient oneself in pitch black darkness? By using red light!

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