A. To help with your odyssey, the ancient Greek god Hermes delivers you a watch that has been set to the local time at Greenwich, which is located on the Prime Meridian. You see that the time (in Greenwich) is midnight and that the date is September 21, the autumn equinox. What value of right ascension is directly overhead Greenwich right now? Explain. *Hints: Your result should be measured in hours (of right ascension, not of time).

B. Looking at the constellations again, you observe that the star Eta Cassiopeiae is on your meridian. You consult your star charts and find that Eta Cassiopeiae has a right ascension of 0.837 hours. In how many hours will Eta Cassiopeiae be directly overhead in Greenwich (on their meridian)? Explain.
*Hint: Your answer can be a decimal number of hours.

C. Given that there are 15 degrees in every 1 hour of right ascension, and that Eta Cassiopeiae has not yet passed over Greenwich during the star's apparent motion from East to West across the sky, what is your longitude? Show your work and explain.
*Hint: Your result should be measured in either degrees East or degrees West.