Time

=**__THE BIG BAND THEORY!__**=
 * The big bang took place about 13.7 billion years ago. A black hole are areas of intense gravitational pressure. Yes it continues to expand and cool to this day and we are inside of it. Experts however say that there was no explosion. The abundance of the "light elements" Hydrogen and Helium found in the observable universe are thought to support the Big Bang model of origins.**

**__TIME KEEPS ON SLIPPIN!__**

 * The currant calendar most of the world uses is the Gregorian calendar.**
 * The Republic of China uses two official calendars: the [|Gregorian calendar], and the [|Minguo calendar]. Taiwan also uses the [|lunar calendar] for traditional festivals such as the [|Chinese New Year], the [|Lantern Festival], and the [|Dragon Boat Festival].**
 * [|Rapa Nui calendar], Ancient Macedonian calendar, and Egyptian calendar**.

There are 21 periods of when.
 * A leap year (or intercalary or bissextile year) is a year containing one extra day (or, in the case of [|lunisolar calendars], a month) in order to keep the [|calendar year] synchronized with the [|astronomical] or [|seasonal year].**
 * BC means before christ.**
 * BCE means Before Common Era.**
 * The meaning of AD is Anno Domini or Year of our Lord referring to the year of Christ’s birth.**
 * CE is a recent term meaning common era.**
 * MYA is a time line of many things.**
 * Eons are divided into eras, which are in turn divided into periods, epochs and ages.**
 * [|Epoch (reference date)], a moment in time chosen as the origin of a particular era.**


 * [|Rapa Nui calendar], Ancient Macedonian calendar, and Egyptian calendar.**


 * Egyptian shadow clocks divided [|daytime] into 10 parts, with an additional four "[|twilight] hours"—two in the morning, and two in the evening. Water clock, or clepsydrae, were commonly used in [|Ancient Greece] following their introduction by [|Plato], who also invented a water-based [|alarm clock].[|[23]][|[24]] One account of Plato's alarm clock describes it as depending on the nightly overflow of a vessel containing lead balls, which floated in a columnar vat. The vat held a steadily increasing amount of water, supplied by a cistern. By morning, the vessel would have floated high enough to tip over, causing the lead balls to cascade onto a copper platter.**
 * [|Rapa Nui alendar], Ancient Macedonian calendar, and Egyptian calendar.**
 * [|Rapa Nui alendar], Ancient Macedonian calendar, and Egyptian calendar.**

missing 17-23
 * The history of time keeping has evolved from the mechanical clocks employing the [|verge escapement] mechanism were invented in Europe at the turn of the 14th century, and became the standard timekeeping device until the [|spring]-powered clock and [|pocket watch] in the 16th century, followed by the [|pendulum clock] in the 18th century. During the 20th century, [|quartz oscillators] were invented, followed by [|atomic clocks]. Although first used in laboratories, quartz oscillators were both easy to produce and accurate, leading to their use in [|wristwatches]. Atomic clocks are far more accurate than any previous timekeeping device, and are used to calibrate other clocks and to calculate the [|proper time] on Earth; a standardized civil system, [|Coordinated Universal Time], is based on atomic time.**
 * Scientists have built a clock that is 100,000 times more accurate than the atomic clock currently used for establishing the official time around the world.**
 * A time zone is a region of the earth that has uniform standard time, usually referred to as the local time. By convention, time zones compute their local time as an offset from UTC (see also Greenwich Mean Time). Local time is UTC plus the current time zone offset for the considered location.**
 * The Prime Meridian is the [|meridian] (line of [|longitude]) at which the longitude is defined to be 0°.**