Evidently, yes. Here, from a genuine pointy-headed astrophysicist on physicsforum.com:
Calculate the length-of-day ( LD ) by
cos(LD/2) = - tan(declination) tan(latitude)
LD is in degrees that can be converted to hours, min, sec
For locations north of EQUATOR the longest day of the year coincides with the summer solstice.
Don't believe it? Check it for yourself here. (To help you: the coordinates of Yardstick's house, our own equivalent of the Greenwich Royal Observatory, are N 07 12.062 E 100 35.784.) What you'll find is that this year, June 21, 22, and 23 tie for longest, at least when rounded to the nearest minute, at 12 hours and 33 minutes each.
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