Best day to see Cathedral

Best day to see Cathedral

I have the opportunity to visit Chartres Cathedral from Paris either on a Sunday or Weds. Which day would be better? Is the cathedral actually open on a Sunday so we can go inside since they have morning masses there? Could somebody please give me the hours for a Sunday for the cathedral? Not a tour or the crypt or the tower, just the main part of the cathedral. I would be really upset to make the trip out there on a Sunday and not be able to enter the cathedral. I am leaving for Paris next week, so thanks for your prompt answer.

Question about Chartres Cathedral

Chartres is still open on Sundays, but there aren't any tours that day because of masses etc. The middle of the day would probably be the quietest if you just want to look around but it's always nice to experience a service if possible.