Answer:
Personal observation is a subset category, in which the researcher is the primary instrument for monitoring and data collection, and is widely used with ethnography. Collection can be covert or overt, participatory or not, and can vary in degree of invasiveness to the participants' lives.
Explanation:
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the answer to your question is D. Islam.
During the 600s the Islamic religion spread towards Northern Africa.
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The astrometric method is searching for tiny wobbles in the position of the star due to the gravitational pull of a planet orbiting around it.
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The Moons rotation is precisely equal to it’s period of revolution.