The navigational device is an example of <u>Arabesques</u>-Islamic artistic technique.
<u>Explanation:</u>
Islamic astrolabe is widely used in astronomical field for measuring the altitudes of celestial bodies. Astrolabe was used as a navigation instrument by many sailors, intelligent philosophers and astrologers.
Greek astronomer Hipparchus invented astrolabe. Muslims used astrolabe to find the direction of Mecca.
The astrolabe helps in determining the local time and latitude, and measuring the angles of stars. Astrolabe helps in locating the positions of the Sun, Moon and planets.
I would say it is false that t<span>he need to keep records of taxes led to the development of a written number system, if this is a true/false question.</span>
