Texas Almanac, 2000-2001 Page: 101
672 p. : col. ill., ports. ; 23 cm.View a full description of this book.
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Astronomical Calendar 101
Astronomical Calendar For 2000 and 2001The subsequent calendars were calculated principally
from data in the U.S. Naval Observatory's Internet site
(http://aa.usno.navy.miVAA/data/), and from its publication,
Astronomical Phenomena for 2000 and 2001.
Times listed here are Central Standard Time, except
for the period from 2:00 a.m. on the first Sunday in April
until 2:00 a.m. on the last Sunday in October, when Day-
light Saving Time, which is one hour later than Central
Standard Time, is in effect.
All of Texas is in the Central Time Zone, except El
Paso and Hudspeth counties and the northwest corner of
Culberson County, which observe Mountain Time (see
accompanying map). Mountain Time is one hour earlier
than Central Time.
All times are figured for the Intersection of 99 20'
west longitude and 310 08' north latitude, which is the
location of Brady, McCulloch County. This point is about 22
miles south-southwest of the approximate geographical
center of the state.
To get the time of sunrise or sunset, moonrise or
moonset for any point in Texas, apply the following rule:
Add four minutes to the time given in this calendar for each
degree of longitude that the place lies west of the 99th
meridian; subtract four minutes for each degree of longi-
tude the place lies east of the 99th meridian.
At times there will be considerable variation for dis-
tances north and south of the line of 31 08' north latitude,
but the rule for calculating it is complicated. The formula
given above will get sufficiently close results. An accompa-
nying map shows the intersection for which all times given
here are calculated, with some major Texas cities and theirAll figures show longitude West
except line, 31 08', which is
latitude North. Circle marks point
used for all time calculations in
the Texas Almanac.longitudes. These make it convenient to calculate time at
any given point.
The Naval Observatory's Web site (address above) will
allow you to determine more exactly the rise and set times
of the Sun and the Moon at your location on a given date
or for an entire year.
Planetary Configurations and Phenomena
The phenomena and planetary configurations of
heavens for 2000 and 2001 are given in the center column
of the calendar on pages 103-108. Below is an explanation
of the symbols used in those tables:
) The Sun * The Earth $ Uranus
( The Moon d Mars P Neptune
O Mercury ZL Jupiter E Pluto
9 Venus '1 Saturn
Aspects
r This symbol appearing between 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.
P 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 farthest
from the sun.
* Perihelion - Point at which a planet's orbit is near-
est the sun.
* Apogee - That point of the moon's orbit farthest
from the earth.
* Perigee - That point of the moon's orbit nearest the
earth.
Map for Calculating
Time of
Sunrise, Sunset,
Moonrise, Moonset
(see text for explanation)
0 20'
,ab'
1sD
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Reference the current page of this Book.
Ramos, Mary G. Texas Almanac, 2000-2001, book, 1999; Dallas, Texas. (https://texashistory.unt.edu/ark:/67531/metapth162509/m1/101/: accessed May 1, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Texas State Historical Association.