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periselenium. In DICTIOUS you will not only get to know all the dictionary meanings for the word
periselenium, but we will also tell you about its etymology, its characteristics and you will know how to say
periselenium in singular and plural. Everything you need to know about the word
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English
Etymology
From peri- + seleno- + -ium, Latin form of -ion.
Noun
periselenium (uncountable)
- (astronomy) The point of a body's elliptical orbit about the moon's centre of mass where the distance between the body and the centre of mass is at its minimum.
2004, Science and Technology Series, volume 108, American Astronautical Society, page 162:Hence, the Earth gravity allows the decrease of the particle energy from zero to a negative value and its capture by the moon to an elliptical orbit, e.g., with a periselenium of ~2,000 km and a high aposelenium of ~70,000h km.
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