No evidence regarding the Sega CD being Moon, other than the bios having an image of the moon (which itself is unsubstantial as it's only in the us/uk bios), and the existence of Lunar games (which has fuck all to do with it).
Still, it would be quite logical. If Earth is the Megadrive, Moon is it's first viable expansion of humanity, and Mars is the second viable one.
For the nomad, the motherboards actually say IC BD VENUS MAIN. Not sure where, if anywhere, Mercury is stated for the Game Gear.
Saturn and Titan are no brainers.
Picture Magic ROMs have JANUS in the header.
Neptune is well known... but while we are at it, what is the first source to call it as the Neptune?
I want to see the insides of the Mega Jet and dump the roms for the SKC. Maybe they can tell us more.
As for the Mark V -> Venus connection, I don't think that was the case. They still used the old Mark 1-2-3-4 lineup at the time... But if Venus was just a generic term for the MD hardware, then Sega CD would be Earth, so we have the inner planets of the solar system all lined up in order.
This post has been edited by Meat Miracle: 18 April 2013 - 11:28 AM