Copernicus did not explain, however, exactly how he came to the conclusions that the problem lay in geocentrism and the solution in heliocentrism. As a result, experts have been trying to reconstruct his path to the heliocentric theory ever since.
There Is A Wide Range Of Normal. Normal menstruation can last from one to eight days. For most women with regular menstrual cycles, their period will last on average three to five days. But that doesn't mean that anything is wrong if your period is a few days longer or shorter. Your period is unique to you and how much you bleed and for how many days you bleed will not be the same as anyone else.
The average menstrual cycle length -- that would be from the first day of your period until the next period begins -- is said to be 28 days. There's a misconception that anything shorter or longer than 28 days is not normal, but this isn't true. A cycle as short as 21 days or as long as 35 days is considered normal.