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Physics 21 Online
OpenStudy (anonymous):

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km, in a period of 365.26 days. (a) Suppose Earth and Mars are positioned such that Earth lies on a straight line between Mars and the Sun. Exactly 365.26 days later, when the Earth has completed one orbit, what is the angle between the Earth-Sun line and the Mars-Sun line? (b) The initial situation in part (a) is a closest approach of Mars to Earth. What is the time, in days, between two closest approaches? Assume constant speed and circular orbi

OpenStudy (jamesj):

With respect to part (a), what proportion of the a full revolution, a full orbit has Mars mad in 365.26 days? Take that number, and multiply it by 360 degrees. That will give you it's angle relative to the earth-sun axis.

OpenStudy (jamesj):

Dannyham. I see you're new to OpenStudy, welcome. You'll find that this site works best if ask your question and then engage with someone in conversation, such as myself. We generally don't hand out complete answers here, but prefer to work with you through the problem to help you get to the solution yourself. So when you're back, come and find me or one of the other senior members of the group in Physics chat (bottom tab on your page) and we can make sure you get to the end of the problem successfully.

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