After the colonies cleared up the acid clouds, they found a way to grow a jungle to make oxygen from the carbon dioxide. Now this planet is almost as good as Earth of old days before it fell. Gravity is the same as Earth, but their are differences. On this planet the sun rises in the West, and a day is longer than a year. There will be 121 of 'Earth' days of sunlight, then 121 of darkness (give or take a day for twighlight). It may be strange but everyday is their birthday.