I recently read a thread that pointed to some constants that caught my attention. Before I go off the deep end with a question it would seem to be a good idea to understand exactly how constant are certain constants. I'm specifically curious as to the constants of: Length of a day (sidereal day, solar day and or Stellar day) Length of a year (Sidereal year/stellar year) Also what could impact these figures? I mean..."global climate change" could effectively change the position of the mass of the earth. This changes it's physical properties and density. Imagine if you will, the ice skater. When they pull their arms in the rate of rotation increases noticeably. They let their arms out and the speed decreases. (http://answers.yahoo.com/question/index?qid=20080424125806AAxYP2g) So, if the water from the ice caps all melts and shifts to the oceans the the earth's mass near the equator increases...I.E. ice skater letting arms out. Wouldn't the speed of the planet's rotation change? Decrease?