Panerai Luminor Marina Automatic 40mm PAM 48

First I might be a little too obsessive about this but...I've been wearing the Great White for almost three weeks and here are the results...but read the whole thing before you respond because I am confused.Normally the watch keeps excellent time adding +1-+2 seconds per day. I last wore it for several weeks straight in November and December. It has always been slightly fast for the two years I've owned it.Now I wind it up, set it and wear it for the last 19 days...24hrs a day.Now I'm at exact........

i wonder how did anyone created the constant of time? or something to refer a timing to.at first mechanical watches were invented. and some is said to be not accurate. but how they they knew? they need to refer the time to something that has a constant time. but how would they know that it is constant?as now there is quartz watches, it is said to be very accurate. they calculate how many vibrations in a second. but then again, that need to be timed to count how many vibrations in a second. so i ........