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Astronomical Twilight: The Sun is \(12^{\circ }\) to \(18^{\circ }\) below the horizon. The sky is dark enough to spot … Read more Astronomical Twilight: The Sun is \(12^{\circ }\) to \(18^{\circ }\) below the horizon. The sky is dark enough to spot planets and bright stars, but professional astronomers must wait for complete darkness (\(>18^{\circ }\)) to observe faint galaxies and nebulae. Take what you will with the rest of the title. See less
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