1 Kepler's Task. 2  Accurate Data. 3  Shape of the Path. 4  1. Planets move in ellipses with the Sun at one focus. 5  2. The radius vector describes equal areas in equal times. 6  3. Squares of periodic times are to each other as cubes of the mean distances.
So how fast do the average adult's nails grow? The simple answer is that fingernails grow about one-tenth of an inch (3 millimeters) a month. If you lose a fingernail, it will take four to six months to regrow completely. Toenails take a year to a year and a half to grow from cuticle to tip [source: Robb-Nicholson ].
Skin cells, meanwhile, are longer lived. Grafts can still be successful if taken 12 hours after death. In order for fingernails to grow, new cells need to be produced and this canât happen without glucose. Fingernails grow by an average of 0.1mm per day, a rate which slows as we age.