<html xmlns="http://www.w3.org/1999/xhtml"><head></head><body><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="2" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[2]</anchor-end> <dfn><rubyb xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">時圏<rt xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">hour circle</rt></rubyb></dfn>は、<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">天球</anchor>における、<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">天の北極</anchor>と<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">天の南極</anchor>を通る<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">大円</anchor>です。</p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="3" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[3]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">地球</anchor>における<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">経線</anchor>に相当する<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">天球</anchor>における<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">線</anchor>です。</p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="4" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[4]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">天の子午線</anchor>も参照。</p><figure class="quote"><figcaption><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="1" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[1]</anchor-end> <cite xml:lang="ja">時圏とは - Weblio辞書</cite>
(<time>2017-01-05 23:48:31 +09:00</time>)
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://www.weblio.jp/content/%E6%99%82%E5%9C%8F">http://www.weblio.jp/content/%E6%99%82%E5%9C%8F</anchor-external></figcaption><blockquote><p>天の両極を通るすべての大円の称。天の赤道と常に直交する。時角圏。時円。</p></blockquote></figure></body></html>