Last Updated：2025/11/29

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A highly elliptical orbit with an eccentricity of 0.74, inclination of 63.4 degrees, an argument of perigee of −90 degrees, and an orbital period of half a sidereal day, around the Earth.

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Molniya orbit

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Source Word

Molniya orbit

Noun

broadly

A highly elliptical orbit with an eccentricity of 0.74, inclination of 63.4 degrees, an argument of perigee of −90 degrees, and an orbital period of half a sidereal day, around the Earth.

Japanese Meaning

地球を周回する高い楕円形の軌道で、離心率0.74、軌道傾斜角63.4度、近地点引数が−90度、軌道周期が恒星日のおよそ半分である軌道

What is this buttons?

The communications satellite was placed into a Molniya orbit to provide extended coverage over high-latitude regions.

Google Translation / DeepL Translation

その通信衛星は、高緯度地域への長時間の通信カバレッジを提供するために、偏心率0.74、傾斜角63.4度、近地点引数−90度、軌道周期が恒星日の半分という地球周回の高度楕円軌道に投入された。

Details

Sense（1）

A highly elliptical orbit with an eccentricity of 0.74, inclination of 63.4 degrees, an argument of perigee of −90 degrees, and an orbital period of half a sidereal day, around the Earth.

Sense（2）

By analogy, the equivalent orbit for the southern hemisphere, with the argument of perigee changed to +90 degrees.

Sense（3）

(by extension) Both the northern and southern hemisphere orbits for the Earth.

Sense（4）

By analogy, equivalent orbits for other bodies, which provide low apparent motion across the dome of the sky at apoapsis, allowing long duration communications/observation with low tracking rates at polar latitudes.

Sense（5）

(by extension) The orbits around Earth and other bodies with these qualities.

Molniya orbits

（ plural ）

Details

Molniya orbit

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Molniya orbit

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