Sundial is the ancient or classic timekeeper device, especially prior to theinvention of mechanical clock. In the classical Islamic civilization, the dailymovement of the Sun becomes main indicator of praying time, which can bededuced using sundial. This kind of device probably permeated to Indonesiaduring the Islamic acculturation. Since then, the development of astronomicalknowledge, technology, art and architectural in classical Indonesia arepartially reflected into sundial. These historical attractions of sundialdemand comprehensive documentation and investigation of Indonesian sundialwhich are rarely found in the current literatures. The required spatial andtemporal information regarding Indonesian sundial can be collected by generalpublic through citizen science scheme. This concept may answer scientificcuriosity of a research and also educate the people, expose them with science.In this article, general scheme of citizen science are discussed, itsapplication for sundial study in Indonesia is proposed as Suryakala-Nusantaraprogram.
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