It's not the sun and moon, it's caused by people, walking. Yes it's been irrefutably proven by a group of special scientists that the constant pressure exerted upon the ground by people taking too many steps has brought us to the brink of calamity! A hurried meeting is being arranged out of which a cap and trade system is being developed that would essentially tax walking. People will all be chipped with wireless rfid transmitting pedometers so that they can track our usage. Those who need to walk more can purchase 'credits' from those who barely move at all. We must all do our part to eliminate seismic change!