The Butler County press. [volume] (Hamilton, Ohio) 1900-1946, 1914-10-23
The MIDNIGHT sun!
Really Seen but Once a Year In
the Polar Regions.
A SWING ROUND THE HORIZON.
For One Whole Day, About June II at
the North Pole and About Dec. % at
the South Pole, Old Sol Keeps His
Blazing Face In Full View.

IHe 0ouln Toier Otu ooi NeePS TlIS
Blazing Face In Full View.
'"rhe midnight sun" is one Of those
seemingly mysterious natural phenom-
ena which exercise perpetual charm
over the popular Imagination. The
northern part of Scandinavia has ac-
quired for itself the distinctive name
of the Land of the Midnight Sun"
but the title should be extended to in
clude a complete circuit of the earth
along the arctic circle. Then. too, the
southern hemisphere has a precisely
similar phenomenon, which occurs
along the antarctic circle, including a
portion of Wilkes Land.
Properly speaking, a midnight sun
is seen but once year in either hemi-
sphere.
Conhaing our attention to the north
ern hemisphere, the midnight sun is
visible near the arctic circle on the
date of the summer solstice, which oc-
ours about June q at the time when
the sun in its apparent annual circuit
of the sky reaches its greatest north
ern declination. which means its great
est distance north of the equator. This
distance in angular measure is about
2315 degrees. which is precisely equal
to the inclination of the earth's axis
of rotation from a perpendicular to the
plane of its orbit around the sun
The arctic circle is situated this same
angular distance (23la degrees) from
the north pole When the sun is di-
rectly over the equator, about March
q, its light reaches simultaneously
both poles of the earth. AS the sun
begins to move northward the light
quits the south pole, which then en-
ters its period Of six months night
But at the same time the sun rises
higher at the north pole, which in its
turn enters upon its period of six
months day
In the meantime, along the arctic
circle, the days grow longer and the
nights shorter, as the sun comes con
tinually northward, until, at the sol
north of the equator, there will be one
period of twenty four hours during
which the sun does not set at all in
the arctic circle
At the hour Of midnight on that day
the sun, describing circle through
the sky, just touches the edge of the
horizon In the north, like the bob OF a
gigantic pendulum, and then. without
disappearing. Immediately begins to
rise again To describe the other half
of its sweep in the sky
This is the phenomenon called the
midnight sun"
Conversely at the time Of the winter
solstice, which occurs about Dec %,
when the sun is at its greatest south
ern declination. there is one absolutely
sunless day on the arctic circle, when
the sun skins just under the southern
horizon at noon.
AS a matter of fact owing to the
effects Of the refraction of the atmos-
| phere, which means the power of the
air to bend the rays OF light so that
the sun appears to be above the hori-
zon by about its own diameter, when
it is really its own diameter below It.
the phenomena just described are Wis.
ible half a degree about thirty five
miles, south of the arctic circle
After the day of the solstice the sun
begins to dip below the horizon again
because it is then going south once
more, and the nights, beginning with
length OF only few minutes, grad
ually increase until they, too, for one
single occasion. attain the length OF
! twenty-four hours.
Within the arctic circle the days and
nights alternately, greatly exceed
twenty-four hours in length AT the
very pole, as we have seen, they each
last six months In Lapland they may
be month long and at the North
cape three months. Garrett p. Seryiss
| In Spokane Spokesman Review.