…Due to planetary precession, the ecliptic obliquity (the angle between the equator and the ecliptic) increases or decreases by about 2° from 23° over a period of tens of thousands of years, but is currently decreasing by about 0″.468 per year. The combination of solar and lunar precession and planetary precession is called general precession. In addition, there is geodetic precession, which is estimated from the distortion of space near the sun according to the general theory of relativity.… *Some of the terminology explanations that refer to "general precession" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…惑星歳差によって数万年の周期で黄道傾斜角(赤道面と黄道面の作る角度)は23゜から2゜くらい増減するが,現在は1年に0″.468くらい減少している。日月歳差と惑星歳差を合わせて一般歳差という。さらに一般相対性理論による太陽近傍の空間のゆがみから推定される測地歳差がある。… ※「一般歳差」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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