Need help with a novel (astronomy)

[SebastianP]

I've been writing a huge novel for almost 20 years. I'm trying to finish it up now. One of the jams I am in relates to the calendar. I set the story on a different planet with different length of days and days per year etc. I confess I chose these things pretty randomly. Which has become a problem.

I was wondering if there was some whiz around here who could reverse-engineer all that & tell me what the size & orbit of my planet would be, moon phases etc. Just so I can go in and make everything logical & consistent. That would be a great help!

[Gawdzilla Sama]

Find the distance the Earth travels in one day. Multiply that by the days in your calendar. That's the circumference of the orbit. You don't have to be more precise than that for most purposes.

[Don't Panic]

Find the distance the Earth travels in one day. Multiply that by the days in your calendar. That's the circumference of the orbit. You don't have to be more precise than that for most purposes.

Earth is an average of 93 million miles from the sun, that's the radius, so times pi for circumference.

[Xamonas Chegwé]

Find the distance the Earth travels in one day. Multiply that by the days in your calendar. That's the circumference of the orbit. You don't have to be more precise than that for most purposes.

Earth is an average of 93 million miles from the sun, that's the radius, so times pi for circumference.

Ahem! Better double that figure. Maths fail, Kev! Give yourself a sound thrashing! C = 2πr.

[Feck]

I thought the circumference was Pi 2r XC or Pi D ?

[Xamonas Chegwé]

Phi?

[Feck]

Phi?

ah pendantry ........... Happy now ?

[Feck]

Find the distance the Earth travels in one day. Multiply that by the days in your calendar. That's the circumference of the orbit. You don't have to be more precise than that for most purposes.

Earth is an average of 93 million miles from the sun, that's the radius, so times pi for circumference.

Ahem! Better double that figure. Maths fail, Kev! Give yourself a sound thrashing! C = 2πr.

[Xamonas Chegwé]

Phi?

ah pendantry ........... Happy now ?

d = 2r

C = πd OR 2πr OR π2r OR any other rearrangement of 2, π and r.

klr equated C with πr. I expect he will hand in his pedant badge at the desk once he realises this.

Phi is the Greek equivalent of our letter f, written ϕ.

[SebastianP]

If I could do those kinds of calculations I wouldn't need help!

[cowiz]

I like pie

[amused]

[SebastianP]

But is Pi cherry or apple...?

[amused]

I think it's peach, as in, ain't it peachy keen how them maths work!

Remember that if you have inhabited planets that they need to be in the habitable zone (there's another word for that) around a star.

I've always wondered, if a habitable planet is much bigger than earth, would life evolve bigger animals with bigger muscles to compensate for the higher gravity, or would it evolve smaller animals that are lighter?

And you can get away with things that might not really work anyway. The planet in Pitch Black had three suns, and yet still managed to be pitched into total darkness, all the while evolving animals that were ultra-sensitive to light.

[Don't Panic]

Find the distance the Earth travels in one day. Multiply that by the days in your calendar. That's the circumference of the orbit. You don't have to be more precise than that for most purposes.

Earth is an average of 93 million miles from the sun, that's the radius, so times pi for circumference.

Ahem! Better double that figure. Maths fail, Kev! Give yourself a sound thrashing! C = 2πr.

I'm DP, not Kev, are you high?