yanessa t1_j7cdk0u wrote
Reply to comment by CreatureOfPrometheus in Is the yearly cycle of varying daylight durations from day to day throughout time consistent? Is the cycle we have today the same as in the 17th century? by meellowstar
ad1) summer/winter time was introduced in the 20th century (first official use 1908 inOntario, Canada) so n.a. here
ad2) time zones started being used in the latter 19th century for railways
the differing hour length from medieval time measurement is a better bet
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