San Antonio light. [volume] (San Antonio, Tex.) 1911-1993, 1923-08-05
Sun Eclipse Visible Here
Afternoon of September 10

lance of the moon from the earth
which is 23S,S00 miles, it is obvious
that ordinarily the moons shadow
will not reach the earth. On account
of the eccentrieity of the moons
orbit, however, our satellite is much
of the time considerably nearer than
within 221, 800 miles from the eaYth's
center, or about 275.650 miles from
its surface. The shadow, also, under
favorable circumstances, may have a
length of 236,050 miles. It's point,
therefore, may at times extend near
ly 1S,400 miles beyond the earth's
surface.
Speed Like Cannon Ball.
"The cross-section of the shadow
where the earth's surface cuts it. will
then be 167 miles in diameter. Should
the shadow strike obliQuely on the
surface of the earth, as it must ex-
cept when the moon is in the zenith,
the shadow spot will be oval in
stead of circular and the length of
the oval along the earth's surface
may much exceed the true cross sec
ton of the shadow.
"When the shadow fails to reach
the earth, an observer will see the
moon projected upon the sun, leav-
ing an uneclipsed ring around it.
There would be what is called an
annular eclipse of the sun.
"The moon advances along its orbit
very nearly 210O miles an hour. Were
it not for the rotation Of the earth
this is the rate ut which the shadow
would pass the observer. The earth,
however, is rotating toward the east
in the same general direction as that
in which the shadow moves. The
surface OF the earth moves at the
rate of 1910 miles an hour at the
equator. An observer on the earth's
equator, with the moon near the
zenith, would be passed by the shadow
with speed of about 1860 miles an
hour. This would be its slowest
velocity which is about equal to that
of a cannon ball,
"A total eclipse of the sun OBJ
served ut q station near the equator
under the most favorable conditions
possible-the shadow spot having its
maximum diameter of 1877 miles
may sometimes last for seven min
utes and fifty-eight seconds"
Venus Will BE Near.
An interesting phase Of the
eclipse, Mr.. Duerler has revealed,
will be the proximity of Venus to
the sun. This planet will be only
81 minutes east and one degree and
Is seconds north of the suns center.
This planet, Mr.. Duerler said, will
undoubtedly appear on many of the
eclipse photographs of the corona.
The eclipse will be visible as O
total eclipse in California at the
following points: Avalon, Point
| Conception, San Clemente Island
San Diego and Santa Barbara. In
other parts of the United States il
will be visible as a partial eclipse
The next total eclipse visible in the
United States will not occur until
1925.
The eclipse will begin in San An
tonic ut 2:17 o'clock. local time,
on the afternoon of September 10
At San Antonio, the magnitude OF
the partial eclipse will be 0 49,, Mr..
Duerler has calculated.
The total eclipse will begin al
sunrise in the Pacific Ocean west
| of Alaska and will end at sunset
south of Jamaica. At Nome, Alaska
the partial eclipse begins at S:4J
o'clock q. m, Alaskan time; at Seat.
tie, Wash, 1:15 a. m. Pacific
time; San Francisco. IL III, Pacific
time; st. Louis, 2 % p. m, central
time; Cincinnati, 2 81, central time
New Orleans. z:32 p. m, central
time; Philadelphia, 2 40 central
time, New York, 3 :43 eastern time
Boston, IA eastern time: Panama,
4 :18 eastern time; and at San Juan,
Porto Rico, 8 :13 Atlantic time.
Here the sun will set partially