Glossary
Terms
- albedo
- aphelion
- argument of perihelion
- ascending node
- astrometry
- au (astronomical unit)
- barycenter
- declination
- descending node
- eccentricity
- ecliptic plane
- ephemeris
- geocentric
- geodetic
- GM
- H (absolute magnitude)
- heliocentric
- inclination
- Lagrange points (L1,L2)
- Laplace plane
- LD (lunar distance)
- line of nodes
- longitude of perihelion
- longitude of the ascending node
- mean anomaly
- mean longitude
- mean motion
- meridian
- meteor
- meteoroid
- minor planet
- NEO (near-Earth object)
- nodal points
- nutation
- obliquity
- orbit
- perigee
- perihelion
- period
- phase angle
- right ascension
- semi-major axis
- time of perihelion passage
- topocentric
- true anomaly
- vernal equinox
perigee
Definition
A trajectory’s closest point to the Earth.