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Time
I will be starting from the biggest units of time to the smallest.
Gigaannum -3.16×10¹⁶ seconds. It is sometimes abbreviated Gy, Ga, Byr and variants. The abbreviations Gya or bya are for "billion years ago", that is a billion years before present.
Exasecond - The exasecond (Es) is a unit of time in the International System of Units, defined as 1018 seconds using the SI prefix system. Exaseconds to Years, 1 exasecond = 31688764615 years.
Petasecond - The petasecond (Ps) is a unit of time in the International System of Units, defined as 1015 seconds using the SI prefix system. 1 Petaseconds to Years (Ps to y) conversion calculator of Time measurement, 1 petasecond = 31,688,764 years.
Megaannum - Mega-annum, usually abbreviated as Ma, is a unit of time equal to one million (106) years. It is commonly used in scientific disciplines such as geology, paleontology, and celestial mechanics to signify very long time periods in the past.
Terasecond - A terasecond (symbol: Ts) is one trillion seconds. That is about 31,700 years. It can be written as 1012 seconds A unit of time equal to 1,000,\1000000000 seconds and with symbol Ts.
Millennium - A millennium (plural millennia or millenniums) is a period of one thousand years, sometimes called a kiloannum (ky), or kiloyear (ky). Sometimes, the word is used specifically for periods of a thousand years that begin at the starting point (initial reference point) of the calendar in consideration (typically the year "1") and at later years that are whole number multiples of a thousand years after the start point.
Century - A century is a period of 100 years. Centuries are numbered ordinally in English and many other languages. The word century comes from the Latin centum, meaning one hundred.
Decade - A decade is a period of 10 years. The word is derived from the Ancient Greek: , romanized: dekas, which means a group of ten. Decades may describe any ten-year period, such as those of a person's life, or refer to specific groupings of calendar years.
Year - A year is the orbital period of a planetary body, for example, the Earth, moving in its orbit around the Sun. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by change in weather, the hours of daylight, and, consequently, vegetation and soil fertility.
Month - A month is a unit of time, used with calendars, that is approximately as long as a natural orbital period of the Moon; the words month and Moon are cognates. The traditional concept arose with the cycle of Moon phases; such lunar months are synodic months and last approximately 29.53 days.
Week - A week is a time unit equal to seven days. It is the standard time period used for cycles of rest days in most parts of the world, mostly alongside although not strictly part of the Gregorian calendar. In many languages, the days of the week are named after classical planets or gods of a pantheon.
Day - The word day has a number of meanings, depending on the context it is used such as of astronomy, physics, and various calendar systems. As a term in physics and astronomy it is approximately the period during which the Earth completes one rotation around its axis, which takes about 24 hours.
Hour - An hour is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. There are 60 minutes in an hour, and 24 hours in a day. The hour was initially established in the ancient Near East as a variable measure of 1⁄12 of the night or daytime.
Minute - The minute is a unit of time usually equal to 1/60 of an hour, or 60 seconds. In the UTC time standard, a minute on rare occasions has 61 seconds, a consequence of leap seconds. Although not an SI unit, the minute is accepted for use with SI units. The SI symbol for minute or minutes is min.
Second - The second is the base unit of time in the International System of Units, commonly understood and historically defined as 1⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.
Millisecond - A millisecond is a thousandth of a second. A unit of 10 milliseconds may be called a centisecond, and one of 100 milliseconds is a decisecond, but these names are rarely used.
Microsecond - A microsecond is an SI unit of time equal to one millionth of a second. Its symbol is μs, sometimes simplified to us when Unicode is not available. A microsecond is equal to 1000 nanoseconds or 1⁄1,000 of a millisecond.
Nanosecond - A nanosecond is an SI unit of time equal to one billionth of a second, that is, 1⁄1 000000000 of a second, or 10⁻⁹ seconds. The term combines the prefix nano- with the basic unit for one-sixtieth of a minute. A nanosecond is equal to 1000 picoseconds or 1⁄1000 microsecond.
Picosecond - A picosecond is an SI unit of time equal to 10−12 or 1⁄1000000000000 (one trillionth) of a second. That is one trillionth, or one millionth of one millionth of a second, or 0.000000000001 seconds. A picosecond is to one second as one second is to approximately 31,689 years.
Zeptosecond - A zeptosecond is a trillionth of a billionth of a second. That's a decimal point followed by 20 zeroes and a 1, and it looks like this: 0.000000000000000000001. The only unit of time shorter than a zeptosecond is a yoctosecond, and Planck time.
Yoctosecond - A yoctosecond (ys) is a septillionth of a second or 10–24 . Yocto comes from the Latin/Greek word octo, meaning "eight", because it is equal to 1000−8. Yocto is the smallest official SI prefix. A yoctosecond is the shortest lifetime measured, so far. One yoctosecond is one trillionth of a trillionth of a second and is comparable to the time it takes light to cross an atomic nucleus.
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