It is stated in the novel that the "fourth quarter of 1983" was "also the sixth quarter of the Ninth Three-Year Plan", which implies that the first quarter of the first three-year plan began in July 1958.
小說指出「1983年第四季度」也是「第九個三年計劃的第六季」，這意味著第一個三年計劃的第一季開始於1958年7月。