The dependence of people in 20th century can’t be underestimated; many aspects have progressed because of people’s mission to seek convenience. Many tools are created to help the daily activities which in fact, it was. After the mundane aspects have been fulfilled, at the beginning of the 21st century, people have started to make many changes about relation between their God. One of them is by using smart phone to perform the function of prayer times notification. This kind of application can remind prayer times like adzan, even though in fact he is far from Muslim majority areas. One of applications that provides prayer time is Sunclock, this application was developed by a senior programmer from Germany, named Henning Benecke. The characteristic of Sunclock Application makes the rating almost perfect; it is 4,5 stars from 5. The famous word, “nothings perfect”, inspire me to make a research about this application, because, Sunclock application has been downloaded by more than 500.000 users in Playstore. There are many users from Indonesia seen by the review in its comment’s column that is using Indonesian language. Besides, prayer times that presented in its application is different from the usual time that used in Indonesia, for example from Website Bimas Islam. The prayer time in Sunclock 10 minutes slower than Bimas Islam. There is a possibility about the different criteria that used in this application and in Indonesia.
Based on the background, the research is formulated into two main problems, they are: algorithm of prayer times in Sunclock Application and the accuracy of prayer times on Sunclock application.
The research is a qualitative descriptive research. This kind of research is to make description systematically, factual, and accurate about an object of study. This system is useful for describing and analyzing data from the Sunclock application. This research also classified as library research, namely research conducted by examining the library materials, in the form of books, encyclopedias, journals, magazines and other sources relevant to the topic that studied in this thesis. The primary data for this research is the analysis about the data from Sunclock application and data confirmation using interviews with Henning Benecke. The data from Sunclock Application is compare to data from Indonesian Ministry of Religious Affairs as the main data from Indonesian government which has accuracy that proven by Ilmu Falak expert.
The result of this research is the algorithm of Sunclock Application to determine the Sun data is different from Ministry of Religious Affairs algorithm, but both have the close result. Although the Sun data used are close, the calculation of Sunclock prayertimes does not use ih}tiyath and has different Sun altitude criteria of Fajr, so the result is different up to 7 minutes at Fajr. But, in other prayer times is only 0 to 1 minute. Still in the rangeof the ih}tiyath that is used by Indonesian Ministry of Religious Affairs. Excepting the criteria of Fajr, the algorithm of Sunclock Application is accurate.