# How would the synodic period of Venus change if both Venus and Earth were moved equal distances away from the Sun? [closed]

Let us say that Earth and Venus are both moved 10 million additional miles from the sun. How would the synodic period of Venus appear to change for an observer on Earth? If 584 days is Venus' current synodic period, how many days would elapse if the planets were adjusted as mentioned?

• This is a question for Astronomy.SE. I am confident they can help you.
– Tom
Aug 18 at 16:59
• In all SE network it helps if you show what have you searched on your own. Being just a couple of formulas that you need, you might find the answer on your own.
– L.Dutch
Aug 18 at 17:10
• Thank you for these helpful comments! Aug 18 at 17:14

If the orbital periods of the two bodies around the third are called $$T_1$$ and $$T_2$$, so that $$T_1 < T_2$$, their synodic period is given by: $$1 \over T_{syn}=1 \over T_1-1 \over T_2$$
The relationship between orbital radius and orbital period is given by $$T= 2\pi\sqrt{a^3/GM}$$