Phrase guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
No pronunciation record was provided for this word.
noun
The concept that the most efficient place for spacecraft to change velocity is at the periapsis (the lowest point of an orbit).
Definition source: English Wiktionary via Wiktextract
Topics: aerospace, astronautics, business, engineering, natural-sciences, physical-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
Named after the physicist Hermann Oberth, who described the concept in 1927.
