Orion is one of the most prominent constellations in the night sky, with Betelgeuse
(5:55 +7:24) being one of Orion’s shoulders and Rigel (5:14 -8:12) being one of Orion’s
(a) (2 marks) What is the local sidereal time when Betelgeuse is highest in the night
(b) (6 marks) On 20 March 2017 in Melbourne, sunset was at 7:31 pm. When did
Orion set that night? (Given an answer accurate to within an hour and discuss
how you reached your answer.)
(c) (3 marks) When Orion is viewed from Melbourne and is transiting the meridian,
does Betelgeuse or Rigel appear to be highest in the sky? Justify your answer.
(d) (2 marks) When Orion is viewed from Melbourne and transiting the meridian,
how is Orion oriented relative to the horizon (i.e., the location of Orion’s head,
waist and feet)? Justify your answer.
(e) (4 marks) When Orion is viewed from Beijing and transiting the meridian, does
Betelgeuse or Rigel appear to be highest in the sky? What is Orion’s orientation
relative to the Beijing horizon?
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