Topic: Days, Months and Years
A day is approximately the period of time during which the Earth completes one rotation around its axis. A solar day is the length of time which elapses between the Sun reaching its highest point in the sky two consecutive times. Each of the twenty-four-hour periods, reckoned from one midnight to the next, into which a week, month, or year is divided, and corresponding to a rotation of the earth on its axis. A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; a period of 28 or 30 days or four weeks.
A year is the orbital period of a planetary body, for example, the Earth, moving in its orbit around the Sun. The Gregorian calendar, or modern calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days. A century is a hundred (100) years and a millennium is a thousand (1000) years. Enjoy the video below