Calendars and Timekeeping
Sundials are devices for telling time by measuring the position of the shadow of the sun. This category lists websites concerned with the theory of sundials.
Kids and Teens: School Time: Science: Astronomy and Space: Time
Science: Technology: Metrology
Science: Reference: Standards: Individual Standards: ISO: ISO 8601
Science: Astronomy: Amateur: Sky Calendars
Society: Holidays: Calendars and Lists
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