Does the Earth's Gravity change

Does the earths gravity change . By this I mean are there days where the Earths gravity has more pull on things or less pull. If so is there any proof of this happening in the past.

Hi free_spirit:

The earth's gravitational field has changed over history, but this takes centuries, not a day to day occurence. You can check out this article to read more about it:

www.gsfc.nasa.gov...

It can fluctuate on a year-to-year scale, but you are not going to notice unless you have several hundred thousand $$ to spend on some very expensive and very sensitive equipment. The difference even over several years is way out in decimal point land of a percent. Your day-to-day difference in body weight (for example before and after using the toilet) will have an exponentially greater effect.