phys0001_assignment01

phys0001_assignment01 - 4) In the Chinese Agricultural...

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Assignment 1 Due date: October 5, 2009 1) a) One common length unit in astronomy is astronomical unit (A.U.). How long is 1 A.U. in terms of meters? b) Look up the mean diameter of the Moon and the mean Earth-Moon distance. c) By using the above data, calculate the mean angular size of the Moon. d) During total solar eclipses, the angular size of the Moon is just large enough to cover the Sun. Estimate the diameter of the Sun. 2) If the direction of rotation of the Earth was reversed and the direction of revolution remained the same, would the sidereal day be longer than the solar day? 3) Is Venus a morning star or evening star in these two weeks (end of September)? How about Mercury? (This is Question 4 of Assignment 1 in 2007-2008.)
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Unformatted text preview: 4) In the Chinese Agricultural Calendar, a month is defined by the synodic month and a year consists of integral number of month. Hence, in some years, there are thirteen, instead of usual twelve, months. That extra month is called leap month. Given that a year has 365.24 solar days and a synodic month has 29.53 solar days. How many leap months are there in 19 years? 5) Let's assume for simplicity that the orbital plane of Mars is the same as the orbital plane of Earth, and the angle between its rotational axis and revolution axis is 25°. For observers on Mars, is their north celestial pole same as ours? Is their ecliptic same as ours? Are their zodiac same as ours? Can they observe retrograde motion of the Earth?...
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