Meanings
noun
- pluralplural of periastron
[…]apoastra (i) and the circle of the periastra (2).
1988 January 19, D. V. Gal’tsov, É. Masar, “Motion of bodies in Schwarzschild spacetime with conical singularities”, in Theoretical and Mathematical Physics, volume 80, published August 19892 more examples
The rest of the plot shows the temporal evolution of the periastra and apoastra of the three planets using the nominal parameters on the left as initial conditions.
1999 April 22, Jack J. Lissauer, “Three planets for Upsilon Andromedae”, in Nature, volume 398, Macmillan Magazines Ltd, figure 1, page 659, column 2The planets’ masses are given in units of M_⊕ and the periastra, semimajor axes and apoastra are shown below.
2010, Imke de Pater, Jack J. Lissauer, “Exoplanet Formation Models”, in Planetary Sciences, 2nd edition, Cambridge University Press, →ISBN, figure 13.28, page 547, column 2
Cite this entry
APA
periastra. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/periastra
MLA
“periastra.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/periastra. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “periastra,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/periastra.
Source: periastra on Wiktionary, CC BY-SA 4.0.