perianth

Noun

The point in the orbit of a celestial body, such as a planet or a satellite, that is closest to the body it orbits.

ریشه

Derived from the Greek words 'peri' meaning 'near' and 'apsis' meaning 'orbit'.

مثال

• The periapsis of a satellite is the point in its orbit closest to the Earth.
• The periapsis of a comet is the point in its orbit closest to the Sun.
• The periapsis of a planet determines its closest distance to the star it orbits.

ترکیب‌های رایج

Point of periapsis Orbit periapsis Celestial body periapsis Study of periapsis