The bright star Sirius is at Right Ascension (RA) 6 hr 45 min 09 sec, Declination (Dec) -16 deg 42 min 58 sec.
6. What is the altitude of Sirius, apart from the effect of refraction by the Earth's atmosphere, when it is highest in the sky seen from the Gheens Hall?
7. What is the lowest declination that can be observed from the Gheens Hall?
8. Name a bright star that is too far south to see from the Gheens Hall and give its celestial coordinates.
9. The vernal (spring) equinox for epoch 2000.0 is the reference point for the celestial coordinate system. Ignoring precession, approximately what is the RA of the Sun on March 1?