The following table shows the data of each of the planets, in values relative to the earth (source: https://nssdc.gsfc.nasa.gov/planetary/factsheet/planet_table_ratio.html). For example, you can see that Mercury is 0.38 smaller than Earth, and Jupiter is 11.21 times bigger than Earth. Mercury takes 58.8 days to make one rotation that Earth does in 24 hours, yet makes its way around the sun in just 87.7 earth days.

We will accurately scale the planets relative to the earth's size.

You can try to adjust their positions to be in line with the real distance from the sun. But as mentioned at the top of this chapter (as we saw with the earth and the moon), these distances are literally astronomical! I recommend you just make them evenly spaced out for the purposes of this project so you can see all the planets on your AR device without walking around and keep the planets scaled big enough to observe and enjoy.

You can use the actual rotation (day) and orbit (year) values for each planet. This will be in Unity's earth days, which will be relative to the earth. However, since the outer planets' years are so long, they may not appear to move at all in our model. So, you can perhaps use 1/10th for those or even 1/100 for the really slow ones. Tweak any other value as per your desired effect. The following are the values we used in our version of the project. Your mileage may vary:

Please note that the values in the above table which we have chosen to use in our simulation are accurate in scale and spin rotation, the orbit rate is accurate or scaled as indicated, and the position values (distance from the sun) is completely fudged. (* Orbit rate 10% actual), (** Orbit rate 1% actual).