calculate the angular diameter of Saturn when it lies 9.1 AU from Earth.?

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unknown574

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calculate the angular diameter of Saturn when it lies 9.1 AU from Earth, in arc seconds.

Saturn's moon Titan is observed to orbit 3.1 ' from the planet. What is Titan's orbital period? in days.

Can anyone please help..this is really difficult.
 
You can find an AU. Then you have look up Saturn's diameter. That is in books or on line. Use trigonometry to find angular diameter in degrees or some fraction of one at your distance.
Seperation of Titan from Saturn is measured sometimes from planet's center. But your problem doesn't say if it is from edge of planet or edge of rings. If it is one of the last two, you must know first answer to get the total distance from planet's center.
Rotation rate depends upon masses of T and S and their seperation distance r. Use Newton's equation for gravitational attraction.
 
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