Steve Jackson Games Forums - View Single Post - Reinventing Barsoom: 1 planetology and geography

dcarson · 08-05-2011, 05:58 PM

OK. Horizon is sqrt [ 2 x radius of planet x height above surface + height above surface ^2]

So using 3390 km for radius and 7 km for height of the walls the horizon is 218 km. The canyon is 200 km wide so you can see all the way across. That is using max depth. If parts of the canyon are only 3 km deep you can't see either wall from the middle. If it is less than 6 km you can't see both. Which may be what I'm misremembering.

08-05-2011, 05:58 PM	#10
dcarson Join Date: Mar 2008	Re: Reinventing Barsoom: 1 planetology and geography OK. Horizon is sqrt [ 2 x radius of planet x height above surface + height above surface ^2] So using 3390 km for radius and 7 km for height of the walls the horizon is 218 km. The canyon is 200 km wide so you can see all the way across. That is using max depth. If parts of the canyon are only 3 km deep you can't see either wall from the middle. If it is less than 6 km you can't see both. Which may be what I'm misremembering.