Unformatted text preview: In 19 years, there are 365.24 x 19 = 6939.56 days, and hence, there are 6939.56 / 29.53 = 235 months. In 19 years, there are 19 x 12 = 228 ordinary months. Finally, there are 235  228 = 7 leap months. 5) Recall that the ecliptic is defined as the apparent path of the Sun as the Earth revolves around the Sun. Hence, the ecliptic of Mars is the apparent path of the Sun as Mars revolves around the Sun. It has nothing to do with the rotation of Mars. Now, because the orbital planes of Mars and Earth coincide, the apparent paths are the same, i.e. the ecliptics are the same. The zodiacs are the same. However, because Mars' inclination angle is not the same as ours, its north celestial pole is not same as ours. Lastly, Earth is an inner planet as observed from Mars, and we do observe the retrograde motion of the inner planets. Hence, they can observe retrograde motion of the Earth....
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 Spring '10
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 Planet, Ecliptic, mean earthmoon distance

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