<P> As an example, at the North Cape of Norway at midnight on June 21 / 22, the longitude of 25.9 degrees east makes the moment 103.2 minutes earlier by clock time; but the local time, 2 hours ahead of GMT in the summer, makes it 120 minutes later by clock time . The equation of time at that date is - 2.0 minutes . Therefore, the sun's lowest elevation occurs 120 - 103.2 + 2.0 minutes after midnight: at 00.19 Central European Summer time . On other nearby dates the only thing different is the equation of time, so this remains a reasonable estimate for a considerable period . The sun's altitude remains within half a degree of the minimum of about 5 degrees for about 45 minutes either side of this time . </P> <P> Locations where the sun remains less than 6 (or 7) degrees below the horizon--above 60 ° 34' (or 59 ° 34') latitude south of the Arctic Circle or north of the Antarctic Circle--experience midnight twilight instead of midnight sun, so that daytime activities, such as reading, are still possible without artificial light on a clear night . </P> <P> White Nights have become a common symbol of Saint Petersburg, Russia, where they occur from about 11 June to 2 July, and the last 10 days of June are celebrated with cultural events known as the White Nights Festival . </P> <P> The midnight sun is visible at the Arctic Circle from 12 June until 1 July . This period extends as one travels north: At Cape Nordkinn, Norway, the northernmost point of Continental Europe, the midnight sun lasts approximately from 14 May to 29 July . On the Svalbard archipelago farther north, it lasts from 20 April to 22 August . </P>

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