seasonal hour

plural seasonal hours

1. Synonym of temporal hour.

   Or each seasonal hour of nighttime equals 45m 20s tropical hours. From this it is evident that one seasonal hour of daytime plus one seasonal hour of nighttime is equal to two tropical hours.

   1990, George Noonan, Fixed Stars and Judicial Astrology, American Federation of Astr, →ISBN, page 112

   1 more example

   A second seasonally-varying time unit was the “seasonal hour,” equal to one-quarter of a watch or one-twelfth of the length of a day (daytime seasonal hour) or one-twelfth of the length of a night (nighttime seasonal hour).

   2019, Down to the Hour: Short Time in the Ancient Mediterranean and Near East, BRILL, →ISBN, page 97

   Synonyms: temporal hour