In order to find the amount the planets change the gravitational constant,I needed to find the values of m, which is the mass of the planet/sun, and r, which is the distance from the Earth to the planet/sun. Because the planets orbit in an elliptical shape and the distance from earth can vary extremely, I used the lowest known value for r for each individual planet (and the sun. Fun fact: the point where the earth is closest to the sun is called it's Parihelion). (These m and lowest r values are according to http://www.universetoday.com)
Then, I plugged them all into the equation: which would allow me to find the planet's contribution to the gravitational constant.
Sun m: 1.99e30 kg, r: 147,000,000 km
Mercury m: 3.3e23 kg, r: 77,000,000 km
Venus m: 4.87e24 kg, r: 38,000,000 km
Moon m: 7.348e22 kg, r: 384,4000 km
Earth r: 6,378.1 km
Now, I shall spare you all the horror of looking at all those calculations, because, trust me, it isn't pretty. I'll give you an example, though.
The bottom radius is subtracted by 6378.1km because that is the average radius of the Earth.
In the end, I got this:
But the question is: Will it make a difference?