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42 lines
1.0 KiB
42 lines
1.0 KiB
13 years ago
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<sect1 id="ai-meridian">
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<sect1info>
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<author
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><firstname
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>Jason</firstname
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> <surname
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>Harris</surname
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> </author>
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</sect1info>
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<title
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>Kohalik meridiaan</title>
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<indexterm
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><primary
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>Kohalik meridiaan</primary>
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<seealso
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>Tunninurk</seealso
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> <seealso
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>Taevasfäär</seealso
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> </indexterm>
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<para
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>Meridiaan on kujuteldav <link linkend="ai-greatcircle"
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>suurring</link
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> <link linkend="ai-csphere"
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>taevasfääril</link
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>, mis asub risti kohaliku <link linkend="ai-horizon"
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>horisondiga</link
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>. See kulgeb horisondi põhjapunktist üle <link linkend="ai-cpoles"
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>taevapooluse</link
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> ja <link linkend="ai-zenith"
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>seniidi</link
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> horisondi lõunapunktini. </para
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><para
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>Kuna meridiaan on seotud kohaliku horisondiga, paistavad tähed vastavalt Maa pöörlemisele triivivat üle kohaliku meridiaani. Taevakeha <link linkend="equatorial"
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>otsetõusu</link
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> ja <link linkend="ai-sidereal"
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>kohalikku täheaega</link
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> kasutades saab määrata, millal taevakeha läbib sinu kohaliku meridiaani (vaata <link linkend="ai-hourangle"
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>tunninurk</link
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>). </para>
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</sect1>
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