This concise first volume of Worldbuilding For Writers, Gamers and Other Creators provides straightforward guidance on how to model the astronomical elements of an Earth-like planet for your storyworld setting.
Author and storyworld creator Matthew Wayne Selznick (Brave Men Run -- A Novel of the Sovereign Era) explains the science and helps you through the (basic) math required to...
...Select an appropriate star
...Figure out the best distance for your planet to orbit that star
...Work out the details of gravity, day length, and atmosphere for the planet
...Determine when your planet's moon is full
...and much more... all with just a calculator. No advanced degree required!
Worldbuilding For Writers, Gamers and Other Creators Volume One: Star, Planet, Moon is approximately 8,000 words.