See apogee.
See apse.
The point in an elliptical orbit around the Earth that is nearest the Earth’s centre.
https://solarsystem.nasa.gov/galleries/near-and-far
The point at which an object, travelling in an elliptical orbit around the Earth, is at its closest to the Earth. The point at which it is furthest from the Earth is the apogee.
The point nearest the planet in the orbit of a satellite, originally defined for the lunar orbit. Compare apogee.
- propane
- propanedioic acid
- propanoic acid
- propanol
- propanone
- proparian
- propellant
- propeller
- propenal
- propene
- propenoate
- propenoic acid
- propenol
- propenonitrile
- propensity
- propensity score
- propensity score matching
- propensity to consume
- propensity to save
- propenyl group
- proper ancestor
- proper class
- proper divisor
- proper factor
- proper fraction