V2EX celestial poles

Celestial Poles

释义 Definition

天球极(北天极与南天极):地球自转轴向外延伸,与假想的“天球”相交的两点。它们是天球坐标系的重要参照点,用于定位天体位置与描述天球的旋转。

发音 Pronunciation (IPA)

/slstil polz/

例句 Examples

The North Star lies near the north celestial pole.
北极星位于北天极附近。

Because of axial precession, the position of the celestial poles slowly traces circles on the sky over thousands of years.
由于地轴进动,天球极的位置会在数千年间缓慢地在天空中画出圆形轨迹。

词源 Etymology

celestial 来自拉丁语 caelestis(“天空的、天上的”),源于 caelum(“天空”);pole 来自希腊语 polos(“轴、天轴”)。合起来指“天空(天球)上的轴端点”,即天球自转轴的两端。

相关词 Related Words

文学与典籍用例 Literary Works

  • Cosmos(Carl Sagan)以通俗方式讲解天球坐标与天体定位概念时常涉及天极。
  • The American Practical Navigator(Nathaniel Bowditch)航海天文定位中讨论天球、天极与赤道坐标体系。
  • Norton’s Star Atlas(Arthur P. Norton)星图与观测指南中用于说明天球旋转中心与坐标参考点。
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