PPRuNe Forums - Twilight

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Olendirk

18th Jun 2004 04:57

Twilight

Hey!

Theres a question: How long is the twilight for an observer at the north pole? Is it correct that you cant say that without knowing the date?

Thanks!

OD

oxford blue

18th Jun 2004 07:58

From the 7th October till the 4th Mar, there is 24 hour a day darkness at North Pole.

From the 18th March till the 24th September, there is 24 hour a day daylight at the North pole.

But between the 5th -17th March, and then again, from 25th Sep to 6th October, you get 24 hour a day twilight at the North Pole, ie, the Sun is permanently below the horizon, but never lower than 6º depression angle.

Olendirk

18th Jun 2004 08:37

Thanks!That helps me a lot.

Thanka a lot again!

OD

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