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 last day before your next period would be Day 28 if you have the average 28-day menstrual cycle. Normal menstrual cycle length, in adolescent girls, is 21 to 45 days. Normal menstrual cycle length in adult women is from 21 to 35 days. During the first few years of menstruation, periods are often irregular. You may skip several months between your first period, or menarche, and the next time you menstruate. It is also probable that you may have two periods that are 28 days apart and then skip a period.