Noun
That point, in the real or apparent orbit of one star revolving around another, at which the former is nearest to the latter.
Source: Webster's dictionaryIn the true orbit, closest approach or periastron was in August 1955, and next in May 2035. Source: Internet
See also portal * Sothic cycle Notes Two full 50.09-year orbits following the periastron epoch of 1894.13 gives a date of 1994.31. Source: Internet