... are acknowledge the world about the length of the chord in the circle. In trigometry he also applied various theorem, proof and calculation and he also used some of these theorems in order to solve the problem facing by the astronomy in his time period. On the other hand one of the well known expositions by Ptolemy was named as " ... , Ptolemy revealed that some sort of object in the world and its image in mirror makes the angles equal to the mirror. For this purpose, Ptolemy measured the angle of incidence and the angle of reflection for curved mirror and also for the planar mirrors...

• Word Count: 1666
• Approx Pages: 7
• Has Bibliography

... started to play an important role in the design of the sun sensor. One of the more popular sun sensor works by measuring the sun's angle in two orthogonal axes. It will measure the sun's angle in both azimuth and elevation to get its position. The sun sensor is an important part of any satellite as it is used to determine the ... . The sun presence in the field of view of the command unit will start the measurement unit. The measurement unit provides a digital output that is a representation of the sun incidence angle relative to the normal of the sensor. Figure 3 shows the digital sun s...

• Word Count: 1945
• Approx Pages: 8
• Has Bibliography
• Grade Level: Undergraduate