Texas Almanac, 1986-1987 Page: 81
768 p. : ill. ; 23 cm.View a full description of this book.
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CALENDAR FOR 1986 AND 1987
The subsequent calendars were calculated princi-
pally from basic data in the U.S. Naval Observatory's
publication, the American Ephemeris and Nautical Al-
manac. Data were adapted for use in Texas on the basis
of Central Standard Time, except for the period from 2
a.m. on the last Sunday in April until 2 a.m. on the last
Sunday in October, when Daylight Saving Time, which is
one hour earlier than Central Standard Time, is in
effect.
All of Texas is in-the CST zone except El Paso and
Hudspeth Counties and the northwest corner of Cul-
berson County which observe Mountain Standard Time.
See accompanying map. MST is one hour earlier than
CST.
All times here are figured fgr the intersection of
meridian 98 West and parallel 32 30' North which is
about nine miles northwest of Tolar, Hood County. This
point is chosen because of its central location with re-
spect to Texas and the Southwestern States.
To get Central Standard Time of sunrise or sunset,
moonrise or moonset for any point in Texas apply the
following rules: Add to the time given in this calendar
four minutes for each degree of longitude that any giv-
en place lies west of the 98th meridian; and subtract
four minutes for each degree of longitude such place
lies east of the 98th meridian.
At times there will also be considerable variation
for distances north and south of.the line of latitude 32degrees 30 minutes north, but the rule for calculating it
would be complicated. Procedure given above will get
sufficiently close results.
An accompanying map shows the intersection for
which all time is calculated, with some Texas major
cities and their longitude. These make it convenient to
calculate time at any given point.
Planetary Configurations and Phenomena
In the center column of the calendar on following
pages are given the phenomena and planetary configu-
rations of heavens for 1986 and 1987. Below is an expla-
nation of the signs of the Sun, Moon and planets, and
symbols used in the tables:
O The Sun. The Earth. 6 Uranus.
Q The Moon. 8 Mars. q Neptune.
0 Mercury. U Jupiter. L Pluto.
9 Venus. ' Saturn.
Aspects
6 This symbol appearing before the symbols for heav-
enly bodies means they are "in conjunction," that is
having the same longitude as applies to the sky and
appearing near each other.
This symbol means that the two heavenly bodies are
in "opposition," or differ by 180 degrees of longitude.
Common Astronomical Terms
Aphelion - Point at which a planet's orbit is far-
thest from the sun.'''...... M AP FO R
." ..... I ... J. .. CALCULATING TIME
-rol, OF SUNRISE, SUNSET,
AM,,,, MOONRISE AND
X .. MOONSET
Wx ] I(See text for explanation)
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Texas Almanac, 1986-1987, book, 1985; Dallas, Texas. (https://texashistory.unt.edu/ark:/67531/metapth113818/m1/83/: accessed April 26, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Texas State Historical Association.