Definition of apsis in English:
noun (plural apsides /-siˌdēz/)
Either of two points on the orbit of a planet or satellite that are nearest to or furthest from the body around which it moves.
- In particular there was, according to Aryabhata I, a basic period of 4320000 years called a mahayuga and it was assumed that the sun, the moon, their apsis and node, and the planets reached perfect conjunctions after this period.
- He noted that if the bob was drawn back and released then it followed an elliptical path, and moreover the major axis rotated in the direction of revolution exactly as did the apsides of the moon's orbit.
- For the moon, the line of apsides completes one revolution around the sky in a period of 8.85 years.
Definition of apsis in:
- British & World English dictionary
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.
Most popular in the US
Most popular in the UK
Most popular in Canada
Most popular in Australia
Most popular in Malaysia
Most popular in Pakistan