the midnight sun
noun/ðə ˌmɪdnaɪt ˈsʌn/
/ðə ˌmɪdnaɪt ˈsʌn/
[singular]- the sun that you can see at midnight in the middle of the summer near the North and South Poles
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the midnight sun
Definition of the midnight sun noun from the Oxford Advanced Learner's Dictionary