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Is it possible to experience complete darkness at night on dates near June 21st in Belfast Northern Ireland - without twilight all night?
No, civil twilight lasts all night on June 21 anywhere in Ireland.
On June 21 (approximately....) the Sun is at 23.5 degrees north of the equator. At local midnight, then, the Sun is 23.5 degrees north of the equator - in the Pacific Ocean. Looking north across the pole, the Sun would be on the northern horizon at 66.5 degrees north - which is just north of the northern tip of Iceland.
"Twilight" is defined as when the Sun is less than 18 degrees below the horizon, so the southern edge of twilight would be 66.5-18= 48.5 degrees north latitude.
The southern tip of Ireland, at Mizen Head, is at 51.5 degrees north - so even there, there will be twilight all night long, for probably two weeks either side of the solstice. Belfast is a 54N, so twilight would last all night for about 3 weeks either side of the solstice.
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