1927 The Texas Almanac and State Industrial Guide Page: 45
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THE TEXAS ALMANAC. 45
SOME ASTRONOMICAL FACTS.
Velocity of Light-186,324 statute miles
Length of Year-365 days 5 hours 48
minutes 46 seconds.
Length of Month-Lengtly of the synod-
ical (ordinary) month is 29 days 12 hours
44 minutes 2.8 seconds.
Length of Day-Length of the sidereal
day is 23 hours 56 minutes 4.091 seconds
of mean solar time. Mean solar day is
24 hours- 3 minutes 56.555 seconds of
Dimensions of the Earth-Equatorial
radius, 3.963.34 statute miles; polar radius,
3,949.99 statute miles.
Velocity of Earth-The earth moves
along its orbit at approximately 19 miles
a second, or 1,140 miles an hour. The ro-
tation of the earth on its axis gives the
surface a velocity (rotary) of approxi-
mately 1,000 miles an hour at the equator.
Movements of the Earth-The earth has
three known movements: 1. Revolves on
its axis once in a day, causing lay and
night, 2. Revolves around the sun once in
a year, causing seasons, due to inclination
of axis to the plane of the orbit. 3. Goes
through a movement of approximately 25,-
000 years' duration by which the pole of
the earth as indicated in the sky swings
through a slow circle lying approximate-
ly between the Pole Star and Vegr. This
is believed to be part of.an undulating
movement of the entire plane of the solar
COMMON ASTRONOMICAL AND
Aphelion-Point at which a planet's or-
bit is farthest from the sun.
Perihelion-Point at which a planet's
orbit is nearest the sun.
Apogee--That point of the moon's orbit
farthest from the earth.
Perigee-That point of the moon's orbit
Ilearest the earth.
Aspect-Apparent situation of a planet
with respect to another body.
Conjunction- Said of two heavenly
bodies having the same longitude, or right
ascension. That is appearing in the same
part of the sky. With reference to the
planets with orbits inside the orbit of
the earth, i. e., Mercury and Venus, they
are said to be in inferior conjunction with
the sun when between the earth and the
sun, and in superior conjunction when
opposite the sun from the earth.
Opposition-Said of heavenly bodies
differing 180 degrees of longitude or right
ascension. That is, on opposite sides of
the earth-one rising while the other is
setting. Opposition to the sun is that
aspect of the average heavenly body best
adapted to observation, especially with
reference to the superior planets (those
outside the orbit of the earth) since the
side of the planet next to the earth is
fully exposed to the light of the sun. With
reference to the inferior planets, Mercury,
Venus, however, they are obviously never
in opposition to the 4n and -are 'best ob-
served at approximately .their greatest
distances east and west -f the sun. Thus
they always appear as morning and eve-
ning stars. Only at best advantage -nay
Mercury be detected with the unaided eye
Quadrature-Differing 90 degrees, plus
or minus, in longitude or right ascension
Right Ascension-Astronomical term
relative to position of a star which corre-
sponds to longitude as measured on the
surface of the earth. Right ascension is
measured on the celestial equator, the
first point of Aries being taken as start-
Declination-Astronomical term relative
to position of a star which corresponds to
Nodes-Points at which orbit of a planet
intersects the plane of the ecliptic.
Ascending Node-Point at which planet
passes from south to north side. De-
scending Node--Point at which planet
passes from north to south side.
Zodiac-The twelve divisions of 30 de-
grees each into which the panorama, or
cycle, of the heavens is divided as it is
viewed in the swing of the-earth around
the sun. (See Signs of the Zodiac in pref-
ace to Planetary Cotffigurations.)
During the year 1927 there will be five
eclipses, three of the sun and two of the
Annular Eclipse of Sun-Jan. 3, 1927.
Invisible in United States, will be seen
throughout Southern Pacific. Eastern
Australia, Antarctic regions and Southern
Total Eclipse of Moon-June 15, 1927.
Visible in Texas and United States. South
America, Pacific Ocean and Australia.
Moon will enter umbra at 12:42 o'clock
a. m.; total eclipse will begin at 2 13
a. m.; total eclipse will end at 2:33 a. m.;
moon leaves umbra, 4:05 a. m.
Total Eclipse of Sun-June 29, 1927. In-
visible in United States; will be seen in
extreme northern part of North America,
polar regions, Northern Asia, Europe and
Total Eclipse of Moon-Dec. 8, 1927: In-
visible in United States: visible beginning
generally in Pacific Ocean except the
southern part, Australia, Indian Ocean,
Asia. eastern part of Africa, eastern part
of -Europe and the northern border of
North America; ending visible generally
in the western part of the Pacific Ocean,
Australia, the Indian Ocean, Asia, Africa,
and" northern part of North America.
Partial Eclipse of Sun-Dec. 24, 1927.
Invisible in United States. Beginning
Long. 33 degrees 46 minutes E; Lat. 42
degrees 43 minutes S. and ending Long.
145 degrees 1-3 minutes W., Lat. 50 degrees
48 minutes S., will be visible in Southern
Atlantic and Southern Pacific Oceans.
EASTER SUNDAY, 1927-1910.
1927........ April 17 19 4......... April 1
1928.. ......April 8 1935....... April 21
1929....... March 31 1936........ April 12
1930........ April 20 1937.. ... March 2&
1931........April 5 1938.... ... April 17
1932....... March 27 1939...... April 9
1933........ April 16 1940....... March 24
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1927 The Texas Almanac and State Industrial Guide, book, 1927~; Dallas, Texas. (texashistory.unt.edu/ark:/67531/metapth123785/m1/49/: accessed January 21, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Texas State Historical Association.