How long does the day last?

Question

I need to know the length of the day on June 21st and December 21st in the northern hemisphere. the person that answers first will have the best answer.

Answer 1

12 hours

Answer 2

That depends on how much work you have to complete!

Answer 3

Smart answer: 24 hours, just like any day.

Answer you are more likely looking, i.e. amount of daylight:

Depends on the latitude.  In polar regions north of the Arctic Circle, 24 hours of sunshine on June 21st, zero on December 21st.  For locations between the Equator and the Arctic Circle, varies from almost 24 hours near the Arctic Circle to around 12 hours sunshine at the Equator on June 21st, and from about 12 hours of sunshine near the Equator to almost none near the Arctic Circle on Dec 21st.

Answer 4

Since you stated in the Northern hemisphere without a specific location the time will vary.  At the equator it will be pretty much the same. At the North Pole it will literally be the difference of night and day.  So for a reference sake, let us use Poniatowski - Rietbrock, Wisconsin, the proclaimed exact center of the middle of the northern hemisphere, as a an average.  That would be the 45º North and 90º West.  

Plug that into the NOAA calculator for sunrise and sunset.  This gets 15 hours 37 minutes for June 21st and 8 hours 46 minutes for December 21st.

Check out the 2nd link and plug in your data for wherever you are to find local info.