There are 20 years in a score. The word "score" can be used to mean a set or group of any 20 items, not just years.Continue Reading
The English word "score" is likely derived from an Old Norse word, "skora," which was used to mean a notch or a tally in addition to meaning the number 20.
One of the most well-known uses of the word "score" to mean a group of 20 years is in the Gettysburg Address, in which Abraham Lincoln said, "Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal."
Martin Luther King, Jr. echoed this in the first line of his "I Have a Dream" speech: "Five score years ago, a great American, in whose symbolic shadow we stand signed the Emancipation Proclamation."Learn more about Time & Calendars
The Gregorian calendar was calculated to be 52 weeks long after German astronomer Christopher Clavius proposed that leap years should be counted only if the digits of years ending in 00 were divisible by 400. The Gregorian calendar is based on the Roman Julian calendar.Full Answer >
Although astronomers and geologists use the word "eon" to mean 1 billion years, it is more commonly used to refer to any long, indefinite period of time. Like the words "age," "epoch" and "era," it does not refer to a set number of years.Full Answer >
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.Full Answer >
In Hindu philosophy, the concept of time is expansive, with time units ranging in length from an infinitesimal fraction of a second all the way out to trillions of years. While there are varying schools of thought, there is a common belief in the cyclic nature of time and an incessant cycle of creation and destruction of everything in existence.Full Answer >