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.
- dehydrogenase
- dehydrogenation
- dehydrohalogenation
- deictic
- Deimos
- deindustrialization
- deintellectualization
- deinterleaving
- deionization
- deionized water
- deism
- deixis
- dekatron
- deka‐
- Dekker’s algorithm
- de Klerk, Frederik Willem (1936)
- del
- De la Beche, Sir Henry Thomas
- Delambre, Jean Baptiste Joseph
- delamination
- Delaunay, Charles Eugene (1816–72)
- Delaunay triangles
- Delaunay triangulation
- De Laval, Carl Gustaf Patrik (1845–1913)
- Delaware