Moon or no moon?
The local space environment
One of the early decisions to make for worldbuilding is whether the world, provided it’s not just some alternate history version of our own, has any moon or moons. I’d love to experiment with moon stuff at some later point, but this time, I’m going to settle on a moon in the same kind of size range as our own, because I’ve already decided on what I want to do with the world, and a bit of research seems to tell me that messing around with the Earth-moon system creates a whole new set of environmental factors that would take a lot of time to work out. Do this time, I’m going to settle on a moon that is mostly similar to ours.
What I have so far, using the tables in the book, is:
Sun: a star of spectral class G2, and luminosity class is V, which is in the main sequence.
This means is that the star is towards the top of the G class and actually counts as bigger and brighter than 90% of the stars we know. It also means that the the light is also going to be in the same range as for our sun, with colours in the human visual spectrum. This can be an interesting point in worldbuilding – does the conditions on the planet promote the same kind of sensory organs that we are used to?
The luminosity class deals with the brightness of the star, and at this point, what I’m interested in is that it is the same, or very close, to the same as the sun, just like the spectral class.