An era is not a defined number of years. Rather, it is a period of time marked by certain characteristics, such as historical events. In geology, an era is composed of periods.Know More
According to the Encyclopedia Britannica, geological eras encompass millions of years. The main eras, according to geologists, are the Paleozoic Era, the Mesozoic Era and the Cenozoic Era. The Paleozoic Era, for instance, was approximately 291 million years long, while the Mesozoic Era lasted about 185.5 million years. The Cenozoic Era has been about 65.5 million years long so far as it runs to the present day.
Historical eras are defined by certain historical events or a distinctive period of time. For instance, the Elizabethan era is defined by the reign of Queen Elizabeth the First, who was the Queen of England from 1558 to 1603.Learn more about Time & Calendars
Generally, the eras used to describe the modern Earth are the Quaternary geological era and the Cenozoic evolutionary era. In the future, there may also be a historical era that the current time period, the 21st century, will belong to.Full Answer >
The time zones were standardized in the 19th century in order to maintain the schedules for the train systems. The current system consists of 24 standard meridians of longitude beginning in Greenwich, England. GMT stands for Greenwich Mean Time and is the starting point for the 24 time zones.Full Answer >
Chinese astronomers made an unusual discovery in the 1990s when it was found that the traditional Chinese calendar has an erroneous or "fake" leap month in the year 2033. This traditional calendar works such that its calculations are balanced out by the addition of an entire leap month rather than a single leap day.Full Answer >
There are 26 biweekly pay periods in a year. Bi-weekly means occurring every second week. Although most work weeks are only 5 days, pay periods operate on 7-day rotations. There are 52 weeks in a year, which divided by 2 equals 26.Full Answer >