Mean motion
|
The orbit of a celestial body is usually an ellipse, so the motion of the celestial body on the celestial sphere is not uniform. The mean sun, which is the motion of the sun that is made uniform, is used as the basis for determining time. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
|
360°を天体の公転周期で割ったもの。天体の軌道は通常楕円であるため，天球上の天体の運行は一様ではないが，それを平均した仮想天体の運動のことで，たとえば太陽の運行を一律にならした平均太陽は時間の決定の基本に用いられる。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
Recommend
Swift's scallop
A bivalve mollusca of the family Pectiniidae in t...
Izakuso - Izakunosho
A manor from the Kamakura and Nanboku-cho periods...
Bohdanowicz, B. (English spelling) BohdanowiczB
...Maciej Kamieński's (1734-1821) opera "...
Diacrine secretion
…The secretion method in which secretions escape ...
Mayol
A French marine biologist known as a specialist in...
Tipperary
A city in the west of County Tipperary in southern...
Iroha Gutter - Iroha Gutter
...A city in southern Saitama Prefecture. Establi...
Akadem Gorodok - Akadem Gorodok
… One of the distinctive features of the developm...
Gallery
…In the 19th century, with the industrial product...
Kinri-sama - Kinri-sama
...The terms Mikado and Dairi were abbreviated na...
Karoon [Lake] - Karoon
…the name of a region on the west bank of the Nil...
Liquor tax - shuzei
An indirect consumption tax on alcoholic beverage...
European plum
… [Isao Shimura]. … *Some of the terminology expl...
Keenan, Joseph Berry
Born January 11, 1888 in Pottsmouth, Rhode Island....
Nakīr (English spelling)
…The Qur'an makes direct and indirect referen...