Century Dictionary and Cyclopedia
- n. In the orbit of any heavenly body which moves around another, the point where the former approaches nearest to the primary: usually applied to double stars, but also generally to any satellite.
- n. astronomy That point of the orbit of a celestial body which is closest to the star around which the body is orbiting.
GNU Webster's 1913
- n. (Astron.) That point, in the real or apparent orbit of one star revolving around another, at which the former is nearest to the latter.
- From Ancient Greek περί "around" + ἄστρον "star". (Wiktionary)
“In this scenario, as a smaller companion in the system came on its closest approach periastron the outer layers of the LBV, which are already unstable and loosely bound due to the size of the star, are pulled off due to tidal forces.”
“With these simple starting parameters, Kashi showed that it was possible to produce a situation in which the onset of eruptions was similar to the periastron approach.”
“I therefore predict that a continuous 7 year long observation of pronounced lines may reveal a small doppler shift variation, close to the periastron passage.”
“Importantly, any captured star would form a highly elliptical orbit, whose periastron encounters would strip the outer layers of both stars, leaving their hotter cores exposed – the blue stragglers we see.”
“In the middle of the short but furious northern summer, which includes periastron, total insolation is more than double what Earth gets; in the depth of the long northern winter, it is barely less than Terrestrial average.”
“We won't be under any such extreme condition, but I don't expect they can track us around periastron.”
“Then summer was the six-month period during which Talwin passed from one of those points, through periastron, to the other end of the line segment.”
“The planet's axial inclination was 24-, and northern midsummer fell nearly at periastron.”
“It was midwinter, but also periastron; only long nights and frequent rains marked the season in this hemisphere.”
“These orbs complete a revolution in 180 years, and when in apastron are seventeen times more remote from each other than when at periastron.”
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Words used in Astronomy
being words related to astronomy, stellar cartography, and the music of the spheres, including names of planets, stars and constellations
IE roots ank-, ant- and others
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