Sundials

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.

• Open Directory Kids and Teens: School Time: Science: Astronomy and Space: Time
• Open Directory Reference: Time
• Open Directory Science: Astronomy: Amateur: Sky Calendars
• Open Directory Science: Reference: Standards: Individual Standards: ISO: ISO 8601
• Open Directory Science: Technology: Metrology
• Open Directory Society: Holidays: Calendars and Lists

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