On Sun, 25 Jul 1999, Greyman wrote:

Then there's the fact that Mercury, with a period almost equal to its orbit,
 is a planet of extreme temperatures and Mercury's Senshi powers are water-based.
 Conceivably the Twin Mercuries might have hot- and cold- water based abilities.

Mercury's day is equal to 2/3 of its year.

Scioentists once believed that its period was equal to its orbit, but this
turned out not to be true.