1 The English language is constantly adding words to its repertoire. 2  Each year you may see a few creep into the vernacular that don't appear in the dictionary. 3  They could appeaâ¦. 4  Helping a Young Girl Understand Her First Menstrual Period Most girls experience their first menstrual period between the ages of 12 and 13.
It is also the length of a sidereal day -- the time it takes the earth to rotate 360Â°. A sidereal day could be measured using fixed stars. In conclusion the actual period of rotation of the earth is 23 hours 56 minutes and 4 seconds or 86,164 seconds.
The South Pole is the other point where Earth's axis of rotation intersects its surface, in Antarctica. Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes, and 4 seconds with respect to the stars . Earth's rotation is slowing slightly with time; thus, a day was shorter in the past.