KEPLER'S LAW 1. Name the three celestial coordinates. 2. At what angle is the ecliptic tilted with respect to the celestial equator? What is the physical reason for this angle? 4. What is the vernal equinox, and what does it have to do with the celestial prime meridian? 5. Which is the larger unit of distance, the light-year or the parsec? How much larger is one than the Other? 6. Why is the measurement of distance limited by using the parallax technique? What is this distance limit for stars?

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Center of Gravity and Centroid

The term center of gravity indicates the position or location of a point about which the whole weight of a body or system is supposed to be concentrated, which means the whole weight of the body or system works through this point. It is closely related to mass distribution. For all positions of the body, the center of gravity would be a single point.