Physics 115Homework 11. The ecliptic is the sun's apparent path in the celestial sphere. The zodiac is a belt of constellations that crosses through the ecliptic. 2. The sun sets due west during the Vernal and Autumnal equinoxes. 3. A circumpolar star is one which is always visible in the horizon at a certain latitude. All stars rotate around the celestial poles. The closer one's zenith is to a celestial pole, the more circumpolar stars they will see. Therefore, the north and south pole have the greatest number of circumpolar stars. 4. The Earth's longitude corresponds to the celestial sphere's right ascension. The Earth's latitude corresponds to the celestial sphere's declination. The zero for declination lines lies on the celestial equator. Zero for RA lies where the sun crosses the celestial equator during the vernal equinox, known as the first point of aries. 5. By measuring in hours instead of degrees, we are able to determine at what time stars will be visible from a certain position on Earth.
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