However, I always remembered seeing simulations on TV on how it's believed our solar system was formed. This should be at least as large as a men's shoebox, which is roughly 15' x 10' x 5' (36 x 25 x 13 cm). Creating a solar system through debris I just picked this game up and I'm just tinkering around with creating suns, planets, etc. You'll need to fit nine planets plus the sun into this, so make sure you have enough room. In the prograde case, the fixed point on the epicycle "turns into" the distance gained by orbital rotation (i.e: synodic day vs sidereal day), so all else being equal a fixed point at the equator will spend an equal amount of time on both sides.Ī retrograde planet is really just a more formal way of saying it's rotating upside down relative to its orbit, so the plane curve from your fixed point is going to "jump backward" into the day and then have its rotation "cancel out" the ground gained by the orbital motion, meaning that relative to the point the sun would appear to pause at midday, and equally make stars at around the midnight mark look like they're getting swept/scooped across the sky (unless distant and directly above the point). The planets in your solar system model will hang down inside this box. Just try to think of it in terms of concentric circles, with the day (inside the orbit line) being smaller than the night.Ĭonsider it in terms of epicycloids and fixed points, and look at how progrades work first. ![]() Tbh I didn't either, it's very unintuitive and there's very little information explaining it. ![]() I don't understand how a retrograde planet can have less solar exposure than a prograde one.
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