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 |
![Kiire [town] - Kiire](/upload/images/67cb4e069f58b.webp)
Recommend
Ochigata Plain - Ouchigata Heiya
A plain that spreads across the northwestern part ...
Parrot, A. (English spelling) ParrotA
…An ancient city located in eastern Syria, on the...
Timofeevich Ermak
Cossack leader and conqueror of Siberia. He was a...
Karakum Canal (English spelling)
An irrigation canal in the Republic of Turkmenist...
Via Valeria
One of the important ancient Roman roads that conn...
Forest road - Rindou
This refers to a facility constructed as a traffi...
Double structure - 20 buildings
This term, which describes the structural charact...
Occident
...Therefore, in the Roman era, it was applied to...
benoil
…The young leaves are soft and used as a vegetabl...
isoprenoid
...A general term for hydrocarbons and their deri...
herred
... In Norway, the area from which one ship was s...
Korean School
In addition to the schools in Japan, which were e...
Cephaelis emetica (English spelling) Cephaelisemetica
…[Mr. Makoto Fukuoka] [Mr. Aya Nitta]. … *Some of...
Reduced writing - Genpitsu
Originally, it meant writing characters without s...
Gmund, H. von
…A family of German architects from the 14th cent...