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Various attempts have been made to find a satisfactory answer. It's about an hour of water in Umayyad Mosque, Damascus, t2 design Syria. Every hour, the sound of the clock chiming sound. Apparently, the clock is already there six centuries before the making of Big Ben in London, England, in 1859. In the end, a number of manuscripts collected. The veil of mystery that hour had come to light. The existing manuscripts recounts, the clock is placed at the entrance east Umayyad Mosque t2 design or the right of the exit of the mosque adjacent t2 design to the government palace, t2 design Qasr al-Khadhra. The east entrance is called Bab al-Sa'at which is referred t2 design to as a clock gate. There are also other names are pinned on the entrance, of which Chapter Jayrun and Bab El-Labbadin. The existence and working hours water was described by the early hours of the operator, Ridwan. This was revealed in a manuscript in 600 AH or 1202 AD. The clock was named after the operator, namely Ridwan al-Sa'ati. The existence of that hour is one legacy of Muslim mechanic devices t2 design which immerse the advanced technology in it. Indeed, t2 design at this hour, there are a number of unique and sophisticated technology. This clock shows the importance of the approximate time and placed in a strategic location, between the government palace and the mosque. So, this clock is near the center of government and community activity center. Another uniqueness inherent in this hour is the ability to connect to the Islamic calendar with the seasons change related air condition, set the angle of the sun, as well as the split times of the day and night respectively during the 12 hours that is not affected by whether longer or shorter in a year. Not only that, this clock also informed the audience about the turn of the time every hour with the clang of his voice. In the presence of all abilities at that hour, Ridwan as clock operator awarded high status as a minister in the government. On the other hand, the government also allocated t2 design a special budget for the maintenance and sustainability of the instrument. Some experts say, hours Ridwan included in the group of well-known hydraulic timing devices in the past, such as clepsydra and Ghati. It also shows the development of the construction of watchmaking from time to time. Especially, when the Caliph Harun al-Rashid in 786 AD award water clock made of wood to Charlemagne I, which is the king of the Franks in the West. Believed Similarly, t2 design different forms of similar devices that exist in other regions of the Islamic world. So, watch it spread widely in the Islamic region. According to Ridwan al-Sa'ati manuscript; Ridwan's father, Abu 'Abdullah bin Muhammad bin Nasser bin Khalid al-Saghir Kaysarani, is the first to operate the clock. This was before the Sultan Nur Ed-Din Mahmud bin Zanki took over Damascus in 1154 AD. Kaysarani itself t2 design is a scholar who is an expert in poetry, astronomy, engineering, and mathematics. After him, there was Muhammad ibn Ali al-Khurasani that reconstruct the hours after a fire in 1166. Ridwan al-Sa'ati mention also three person operating hours after the death of his father. They are al-Muhadhab bin al-Naqqash, al-Muhadhab bin al-Hajib, t2 design and Abu al-Fadl al-Najjar. Then, Ridwan which ultimately operate the clock. Ridwan known as Fakhr al-Din al-Sa'ati Ridwan al-Khurasani al-Dimashqi. He served as minister at the time of King Isa ibn al-Malik. Isa also assign a specific budget provision for the maintenance and operation of the clock. On the other hand, the existence of the watch is also very famous. Some travelers are described. There is Rabbi Benjamin of Tuleda who visited Damascus between 1159 and 1174. According to him, Damascus has a synagogue followers of Muhammad. Benjamin stated, it certainly palace of Ibn Haddad. One wall was built with magical powers. On the walls of the building there is a device that is exposed t2 design to the sun and listed the number of days of the solar year. The device was divided into twelve levels to adjust the time of day. This is a picture of the sundial, which is considered to be located near the mosque, not in accordance t2 design with the picture clock made by Ridwan and two other travelers, namely Ibn Jubayr and Ibn Battuta. According Muslimheritage page, a picture of Rabbi Benjamin was wrongly quoted by Donald R Hill in his book Arabic Water Clocks. Ibn Jubayr described the water clock as he traveled and lived in Damascus in 1184. The picture him about an hour it was very close to what is disclosed in the manuscript Ridwan al-Sa'ati. Ibn Battuta picture made in 1326 approximates