[NatureNS] Midnight sun?

References: <000c01c76c11$1a4f58c0$896cb18e@amd3400sempron> <026601c76c18$4f6b1060$4b49b18e@tecras2> <46029866.3080202@glinx.com>
From: Patrick Kelly <patrick.kelly@dal.ca>
Date: Thu, 22 Mar 2007 12:16:22 -0300
To: naturens@chebucto.ns.ca
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Hi everyone:

The only thing I could add to Davids' explanation is the a lot of =20
people thing that above the Arctic Circle, it is pitch black around the =20=

December solstice. Even if the sun stays below the horizon, as it does =20=

just north of the Arctic Circle, there is a large area of "dusk" sky in =20=

that area which provides "just after sunset" illumination all day as =20
the brightest area near the Sun goes around  the horizon in a circle.

To actually get round-the-clock total darkness, you have to go 12=B0 =20
north of the Arctic Circle, so that the Sun is far enough below the =20
horizon to put no light in the sky at all.

Pat


On Mar 22, 2007, at 11:53 AM, David & Alison Webster wrote:

> Hi All,                Mar 22, 2007
>    A physical model, such as an apple on a tilted wire for the earth =20=

> and a bare light bulb, in an otherwise dark room, for the sun, helps =20=

> to visualize this.
>
>    The area nearest the north pole, as John implies, is the first to =20=

> get 24-hr sunlight (early spring) and by the summer solstice this zone =
=20
> of constant daylight has extended downward to the arctic circle.As the =
=20
> season advances to fall, the zone of 24-hr light moves back up to the =20=

> pole and then, in the period from autumnal equinox to winter solstice, =
=20
> 24-hr darkness first arrives at the pole and then extends downward to =20=

> the arctic circle.
>
> Yt, Dave Webster, Kentville
>
> John Sollows wrote:
>
>> To:  Andy
>>
>>
>> From: John
>>
>>
>> date:  march 21/07
>>
>>
>> This morning on CBC radio, they talked with a person who lives way up =
=20
>> north. (I didn't catch the location, but they said it was the most =20=

>> northerly year-round settlement in Canada).
>>
>> The settl;ement in question was Grise Fjord, on the southern coast of =
=20
>> Ellesmere island.  If Alert lights up about now, I suppose Grise =20
>> lighting up a week later makes sense!
>>
>
>
>
>

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20
=3D=3D
Patrick Kelly
Director of Computer Facilities
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20
=3D=3D
Faculty of Architecture and Planning
Dalhousie University
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20
=3D=3D
PO Box 1000 Stn Central                5410 Spring Garden Road
Halifax, Nova Scotia B3J 2X4           Halifax, Nova Scotia B3J 2X4
Canada                                 Canada
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20
=3D=3D
Phone:(902) 494-3294    FAX:(902) 423-6672   E-mail:patrick.kelly@dal.ca
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20
=3D=3D


--Apple-Mail-44-848370889
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	charset=ISO-8859-1

Hi everyone:


The only thing I could add to Davids' explanation is the a lot of
people thing that above the Arctic Circle, it is pitch black around
the December solstice. Even if the sun stays below the horizon, as it
does just north of the Arctic Circle, there is a large area of "dusk"
sky in that area which provides "just after sunset" illumination all
day as the brightest area near the Sun goes around  the horizon in a
circle.


To actually get round-the-clock total darkness, you have to go 12=B0
north of the Arctic Circle, so that the Sun is far enough below the
horizon to put no light in the sky at all.


Pat



On Mar 22, 2007, at 11:53 AM, David & Alison Webster wrote:


<excerpt>Hi All,                Mar 22, 2007

   A physical model, such as an apple on a tilted wire for the earth
and a bare light bulb, in an otherwise dark room, for the sun, helps
to visualize this.


   The area nearest the north pole, as John implies, is the first to
get 24-hr sunlight (early spring) and by the summer solstice this zone
of constant daylight has extended downward to the arctic circle.As the
season advances to fall, the zone of 24-hr light moves back up to the
pole and then, in the period from autumnal equinox to winter solstice,
24-hr darkness first arrives at the pole and then extends downward to
the arctic circle.


Yt, Dave Webster, Kentville


John Sollows wrote:


<excerpt>To:  Andy


=20

From: John


=20

date:  march 21/07


=20

This morning on CBC radio, they talked with a person who lives way up
north. (I didn't catch the location, but they said it was the most
northerly year-round settlement in Canada).=20

=20

The settl;ement in question was Grise Fjord, on the southern coast of
Ellesmere island.  If Alert lights up about now, I suppose Grise
lighting up a week later makes sense!


</excerpt>




</excerpt><fontfamily><param>Courier</param>

=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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Patrick Kelly

Director of Computer Facilities

=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Faculty of Architecture and Planning

Dalhousie University

=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

PO Box 1000 Stn Central                5410 Spring Garden Road

Halifax, Nova Scotia B3J 2X4           Halifax, Nova Scotia B3J 2X4

Canada                                 Canada

=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Phone:(902) 494-3294    FAX:(902) 423-6672 =20
E-mail:patrick.kelly@dal.ca

=
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</fontfamily>


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