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.
Mercury is the planet with the shortest period of revolution of approximately 88 Earth days. However, Mercuryâs period of rotation is about 59 Earth days. A planetâs period of revolution is the time it takes for one complete spin around the sun. This is different from a planetâs period of rotation, which is the spinning of a planet on its own axis. More information on this question: 1. Mercury: One year on planet Mercury takes just 87.97 earth days.