Which type of light source is recommended for checking notes during observation?
Answer
A red light.
White and blue light sources are highly detrimental to night vision because they cause the pupils to constrict and wash out the faint light of meteors, essentially erasing the progress made during dark adaptation. Red light, by contrast, is much less disruptive to the eye's low-light sensitivity. Using a red filter allows the observer to read star maps or notes while maintaining the necessary biological adjustment to see the faintest streaks of light in the night sky.
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