Re: Longest day of year?
- From: "Astucias (Spain)" <astucias@xxxxxxxxx>
- Date: 22 Jun 2005 05:44:12 -0700
It's not true that the longest day in the year in the northern
hemisphere is the summer solstice's day. It is only true for the places
situated over the cancer's tropic.
A solstice is the date in wich the maximun or minimum sun's angular
altitude (measured from the horizon) happens, and a consequence of a
solstice is a maximum or minimum in the daylight time.
In the non-tropical places of the world, there are only two solstices
in a year, but , attending to the deffinition of solstice, in the
tropical places there are four solstices in a year, two of maximum
daylight lenght and other two of minimum. The exact date of these dates
dependes on the latitude for the tropical places, and not depends on
the latitude on the non-tropical places.
What happens in the polar zones?, exactly the same, the longest day in
a polar zone happens the summer solstice's day (for the northern pole),
in fact, this day is so long that, depending on the latitude, you can
find periods of 6 months of daylight.
This is a basic problem of classic astronomy.
.
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