elemtilas
Inkling
So, I am trying to sort out miles per degree of longitude for a planet. I can't seem to make sense of the ratio values (?) I'm getting when comparing Earth and Gea. There's probably something very simple that I'm not seeing, and am hoping someone can point me in the right direction!
What I know:
Earth circumference = 24,901 mi
Gea circumference = 34,851 mi
*Here* we use a 360 degree circle, so, at the equator, a degree of longitude is 69.17 miles.
*There* they use a 288 degree circle, so, at the equator, a degree of longitude is 121.01 miles.
I know that at 90deg north *here*, a degree of longitude is 0 miles; also, *there*, at 72deg north, a degree of longitude will be 0 miles.
When I used a ratio calculator to compare these numbers, of course I got different answers. (Calculators are dangerous toys!)
I've also got a list of Earth miles per degree longitude at varying latitudes that equate to the 72 degree system of Gea. (E.g., 18deg north on Gea is equivalent to 22 1/2 degrees north on Earth).
The calculator I used to get Terran measurements tells me that, at that latitude, a degree of longitude is 63.94 miles. I'm trying to go from there to Gean measurements. Is it just a matter of plugging in a number to multiply by? And if so, which one?
If I compare circumference measurements, I got a ratio of Earth:Gea :: 1:1.3995.
If I compare the miles/degree longitude at the equator, I got 1:1.749.
Shouldn't they be the same?
Help! What am I missing, apart from something like three or four years of high school maths?
Also, I have a notation that a Gean mile is 5760 feet (whereas a Terran mile is 5280 feet). Not sure how that fits or even if that fits into my confusion.
What I know:
Earth circumference = 24,901 mi
Gea circumference = 34,851 mi
*Here* we use a 360 degree circle, so, at the equator, a degree of longitude is 69.17 miles.
*There* they use a 288 degree circle, so, at the equator, a degree of longitude is 121.01 miles.
I know that at 90deg north *here*, a degree of longitude is 0 miles; also, *there*, at 72deg north, a degree of longitude will be 0 miles.
When I used a ratio calculator to compare these numbers, of course I got different answers. (Calculators are dangerous toys!)
I've also got a list of Earth miles per degree longitude at varying latitudes that equate to the 72 degree system of Gea. (E.g., 18deg north on Gea is equivalent to 22 1/2 degrees north on Earth).
The calculator I used to get Terran measurements tells me that, at that latitude, a degree of longitude is 63.94 miles. I'm trying to go from there to Gean measurements. Is it just a matter of plugging in a number to multiply by? And if so, which one?
If I compare circumference measurements, I got a ratio of Earth:Gea :: 1:1.3995.
If I compare the miles/degree longitude at the equator, I got 1:1.749.
Shouldn't they be the same?
Help! What am I missing, apart from something like three or four years of high school maths?
Also, I have a notation that a Gean mile is 5760 feet (whereas a Terran mile is 5280 feet). Not sure how that fits or even if that fits into my confusion.