# translation of kstars_skycoords.po to 
# translation of kstars_skycoords.po to
# translation of kstars_skycoords.po to
# Copyright (C) 2002 Free Software Foundation, Inc.
# Lwandle Mgidlana <lwandle@translate.org.za>, 2002
#
msgid ""
msgstr ""
"Project-Id-Version: kstars_skycoords\n"
"POT-Creation-Date: 2001-02-09 01:25+0100\n"
"PO-Revision-Date: 2002-09-26 12:32+0200\n"
"Last-Translator: Lwandle Mgidlana <lwandle@translate.org.za>\n"
"Language-Team:  <xh@li.org>\n"
"MIME-Version: 1.0\n"
"Content-Type: application/x-xml2pot; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"X-Generator: KBabel 1.0beta2\n"

#: index.docbook:3
#, no-c-format
msgid "<firstname>Jason</firstname> <surname>Harris</surname>"
msgstr ""

#: index.docbook:8
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msgid "Celestial Coordinate Systems"
msgstr ""

#: index.docbook:9
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msgid ""
"A basic requirement for studying the heavens is determining where in the sky "
"things are. To specify sky positions, astronomers have developed several "
"<firstterm>coordinate systems</firstterm>. Each uses a coordinate grid "
"projected on the <link linkend=\"ai-csphere\">Celestial Sphere</link>, in "
"analogy to the <link linkend=\"ai-geocoords\">Geographic coordinate "
"system</link> used on the surface of the Earth. The coordinate systems "
"differ only in their choice of the <firstterm>fundamental plane</firstterm>"
", which divides the sky into two equal hemispheres along a <link "
"linkend=\"ai-greatcircle\">great circle</link>. (the fundamental plane of "
"the geographic system is the Earth's equator). Each coordinate system is "
"named for its choice of fundamental plane."
msgstr ""

#: index.docbook:24
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msgid "The Equatorial Coordinate System"
msgstr ""

#: index.docbook:25
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msgid ""
"The <firstterm>Equatorial coordinate system</firstterm>"
" is probably the most widely used celestial coordinate system. It is also "
"the most closely related to the <link linkend=\"ai-geocoords\">Geographic "
"coordinate system</link>, because they use the same fundamental plane, and "
"the same poles. The projection of the Earth's equator onto the celestial "
"sphere is called the Celestial Equator. Similarly, projecting the geographic "
"Poles onto the celestial sphere defines the North and South <link "
"linkend=\"ai-cpoles\">Celestial Poles</link>."
msgstr ""

#: index.docbook:33
#, no-c-format
msgid ""
"However, there is an important difference between the equatorial and "
"geographic coordinate systems: the geographic system is fixed to the Earth; "
"it rotates as the Earth does. The Equatorial system is fixed to the "
"stars<footnote id=\"fn-precess\"><para>actually, the equatorial coordinates "
"are not quite fixed to the stars. See <link "
"linkend=\"ai-precession\">precession</link>. Also, if <link "
"linkend=\"ai-hourangle\">Hour Angle</link> is used in place of Right "
"Ascension, then the Equatorial system is fixed to the Earth, not to the "
"stars.</para></footnote>, so it appears to rotate across the sky with the "
"stars, but of course it's really the Earth rotating under the fixed sky."
msgstr ""

#: index.docbook:44
#, no-c-format
msgid ""
"The <firstterm>latitudinal</firstterm> (latitude-like) angle of the "
"Equatorial system is called <firstterm>Declination</firstterm> (Dec for "
"short). It measures the angle of an object above or below the Celestial "
"Equator. The <firstterm>longitudinal</firstterm> angle is called the "
"<firstterm>Right Ascension</firstterm>"
" (RA for short). It measures the angle of an object East of the <link "
"linkend=\"ai-equinox\">Vernal Equinox</link>. Unlike longitude, Right "
"Ascension is usually measured in hours instead of degrees, because the "
"apparent rotation of the Equatorial coordinate system is closely related to "
"<link linkend=\"ai-sidereal\">Sidereal Time</link> and <link "
"linkend=\"ai-hourangle\">Hour Angle</link>"
". Since a full rotation of the sky takes 24 hours to complete, there are "
"(360 degrees / 24 hours) = 15 degrees in one Hour of Right Ascension."
msgstr ""

#: index.docbook:61
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msgid "The Horizontal Coordinate System"
msgstr ""

#: index.docbook:62
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msgid ""
"The Horizontal coordinate system uses the observer's local <link "
"linkend=\"ai-horizon\">horizon</link> as the Fundamental Plane. This "
"conveniently divides the sky into the upper hemisphere that you can see, and "
"the lower hemisphere that you can't (because the Earth is in the way). The "
"pole of the upper hemisphere is called the <link "
"linkend=\"ai-zenith\">Zenith</link>. The pole of the lower hemisphere is "
"called the <firstterm>nadir</firstterm>. The angle of an object above or "
"below the horizon is called the <firstterm>Altitude</firstterm> (Alt for "
"short). The angle of an object around the horizon (measured from the North "
"point, toward the East) is called the <firstterm>Azimuth</firstterm>. The "
"Horizontal Coordinate System is sometimes also called the Alt/Az Coordinate "
"System."
msgstr ""

#: index.docbook:74
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msgid ""
"The Horizontal Coordinate System is fixed to the Earth, not the Stars. "
"Therefore, the Altitude and Azimuth of an object changes with time, as the "
"object appears to drift across the sky. In addition, because the Horizontal "
"system is defined by your local horizon, the same object viewed from "
"different locations on Earth at the same time will have different values of "
"Altitude and Azimuth."
msgstr ""

#: index.docbook:81
#, no-c-format
msgid ""
"Horizontal coordinates are very useful for determining the Rise and Set "
"times of an object in the sky. When an object has Altitude=0 degrees, it is "
"either Rising (if its Azimuth is &lt; 180 degrees) or Setting (if its "
"Azimuth is &gt; 180 degrees)."
msgstr ""

#: index.docbook:90
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msgid "The Ecliptic Coordinate System"
msgstr ""

#: index.docbook:91
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msgid ""
"The Ecliptic coordinate system uses the <link "
"linkend=\"ai-ecliptic\">Ecliptic</link> for its Fundamental Plane. The "
"Ecliptic is the path that the Sun appears to follow across the sky over the "
"course of a year. It is also the projection of the Earth's orbital plane "
"onto the Celestial Sphere. The latitudinal angle is called the "
"<firstterm>Ecliptic Latitude</firstterm>, and the longitudinal angle is "
"called the <firstterm>Ecliptic Longitude</firstterm>. Like Right Ascension "
"in the Equatorial system, the zeropoint of the Ecliptic Longitude is the "
"<link linkend=\"ai-equinox\">Vernal Equinox</link>."
msgstr ""

#: index.docbook:101
#, no-c-format
msgid ""
"What do you think such a coordinate system would be useful for? If you "
"guessed charting solar system objects, you're right! Each of the planets "
"(except Pluto) orbits the Sun in roughly the same plane, so they always "
"appear to be somewhere near the Ecliptic (&ie;, they always have small "
"ecliptic latitudes)."
msgstr ""

#: index.docbook:111
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msgid "The Galactic Coordinate System"
msgstr ""

#: index.docbook:112
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msgid ""
"The Galactic coordinate system uses the <firstterm>Milky Way</firstterm> as "
"its Fundamental Plane. The latitudinal angle is called the "
"<firstterm>Galactic Latitude</firstterm>, and the longitudinal angle is "
"called the <firstterm>Galactic Longitude</firstterm>"
". This coordinate system is useful for studying the Galaxy itself. For "
"example, you might want to know how the density of stars changes as a "
"function of Galactic Latitude, to how much the disk of the Milky Way is "
"flattened."
msgstr ""
