Subtitles & vocabulary
ASTR 1P01, CLIP 56: Epicycles; Retrograde Motions in the Geocentric and Heliocentric Models
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QAM Chen posted on 2013/11/05Ever wondered why planets seem to move backward sometimes? This video dives into epicycles and retrograde motion, explaining how ancient astronomers like Ptolemy tried to map the cosmos, and how the heliocentric model finally cracked the code! You'll pick up some awesome astronomy vocabulary and get a clear picture of these fascinating celestial movements.
Video vocabulary
fast
US /fæst/
・
UK /fɑ:st/
- Adjective
- In a way that is difficult to move or change
- Moving or able to move quickly
- Noun
- Period of time when a person chooses not to eat
A1
More start
US /stɑrt/
・
UK /stɑ:t/
- Noun (Countable/Uncountable)
- First time or place that a thing exists; beginning
- Beginning of something in place or time
- Verb (Transitive/Intransitive)
- To do, be or happen for the first time; begin
A1
More ball
US /bɔl/
・
UK /bɔ:l/
- Noun (Countable/Uncountable)
- Large dance where people dress formally
- Small round object often used in a game or sport
A1
More Use Energy
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