Ever the prescriptivist, I wouldn't dare post a reference to a site that began "The Earth is not a perfect sphere. Due to it's rotation..."

And this is a Regents examination preparatory center, no less (though not affiliated with the NYS Board of Regents).

Copyright © 1999-2003 Oswego City School District Regents Exam Prep Center
...RegentsPrep and StudyZone are FREE educational resources.

I guess you get what you pay for.