Units of measurement in astronomy
A billion years or giga-annum (109 years) is a unit of time on the petasecond scale, more precisely equal to 3.16×1016 seconds (or simply 1,000,000,000 years). It is sometimes abbreviated Gy, Ga ("giga-annum"), Byr and variants. The abbreviations Gya or bya are for "billion years ago", i.e. billion years before present. The terms are used in geology, paleontology, geophysics, astronomy, and physical cosmology. The prefix giga- is preferred to billion- to avoid confusion in the long and short scales over the meaning of billion; the postfix annum may be further qualified for precision as a sidereal year or Julian year: 1 Gaj = 3.15576×1016 s,1 Gas = 3.15581×1016 s (epoch J2000.0).1 Gas = 1×109 y Byr was formerly used in English-language geology and astronomy as a unit of one billion years. Subsequently, the term gigaannum (Ga) has increased in usage, with Gy or Gyr still sometimes used in English-language works (at the risk of confusion with Gy as abbreviation for the gray, a unit of radiation exposure). Astronomers use Gyr or Gy (or Ga, where the a stands for annum, Latin for "year") as the symbol for gigayear. (Wikipedia).
2016 - The start of a new (dozenal) century
2016 is the beginning of a new century - if you count in twelves. If you do that then the year 2016 becomes the year 1200. Counting in twelves is known as the dozenal system, and a "century" in dozenal is 144 years, better referred to as a biquennium. To those who point out a new centur
From playlist My Maths Videos
This channel's 1 year anniversary!!!
Thank you everyone for supporting me this year.
From playlist 1st anniversary
From playlist 25 year celebration
Four ways to understand the Earth's age - Joshua M. Sneideman
View full lesson: http://ed.ted.com/lessons/the-earth-s-age-in-measurements-you-can-understand-joshua-m-sneideman The Earth is 4.6 billion years old -- but how can humans relate to a number so colossal, and where do we fit on the geologic timeline? Comparing the Earth's lifetime to one ca
From playlist More TED-Ed Originals
History of computers - A Timeline
A timeline from the first computer, The Turing Machine, to the 1970's. Hope you guys enjoy,and make sure to subscribe and like! Adding subtitles for our video is welcomed! Your translation can help people around the world see our awesome videos! http://www.youtube.com/timedtext_cs_panel?c
From playlist Computers
History of the Holidays: History of Thanksgiving | History
Although Thanksgiving celebrations dated back to the first European settlements in America, it was not until the 1860s that Abraham Lincoln declared the last Thursday of November to be a national holiday. HISTORY®, now reaching more than 98 million homes, is the leading destination for aw
From playlist History of the Holidays | History
Subscribe to our YouTube Channel for all the latest from World Science U. Visit our Website: http://www.worldscienceu.com/ Like us on Facebook: https://www.facebook.com/worldscienceu Follow us on Twitter: https://twitter.com/worldscienceu
From playlist Science Unplugged: Big Ideas
Universe Sandbox 2 - Evolution of Sun & Solar System - 6000000000 Years Later?
Hello and welcome to What Da Math! You can buy Universe Sandbox 2 game here: http://amzn.to/2yJqwU6 In this video, we will talk about how our solar system will evolve over the next few billion years and what will happen to our Earth and the Sun in the process. Enjoy and please subscrib
From playlist Universe Sandbox 2
GCSE level Cosmology covering: universe, galaxy, stars, fermi paradox, alien life, sun, milky way, andromeda, light year, nearest star
From playlist GCSE Physics Revision
Time Value of Money Explained with Scrooge McDuck's Net Worth
Scrooge McDuck claims he can lose a billion dollars per minute and not go broke for 600 years. Is such a thing possible? How much money must Scrooge McDuck have? Subscribe: http://bit.ly/SubTimRicchuiti | Enable ALL push notifications 🔔 You might think this is a simple rate calculation:
From playlist Math Minutes
Why Uber Fails to Disrupt Transportation
Skip the waitlist and invest in blue-chip art for the very first time by signing up for Masterworks: https://www.masterworks.art/modernmba Purchase shares in masterpieces from artists like Pablo Picasso, Banksy, Andy Warhol, and more. How Masterworks works: - Create your account with your
From playlist Season 2
The Andromeda galaxy is on a direct collision course with The Milky Way. Fortunately, it's more than two million light years away and is coming pretty slowly. Everybody, walk for your lives! Or just see the future of the Milky Way—no time-traveling DeLorean required. This video is lectur
From playlist Science
Cosmic background radiation 2 | Scale of the universe | Cosmology & Astronomy | Khan Academy
Cosmic Background Radiation 2 - Redshift of the Cosmic Background Radiation. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/hubble-s-law?utm_source=YT&utm_medium=Desc&utm_campaign=cosm
From playlist Cosmology and astronomy | Physics | Khan Academy
Joel Cohen: An Introduction to Demography (Malthus Miffed: Are People the Problem?) | Big Think
Joel Cohen: An Introduction to Demography (Malthus Miffed: Are People the Problem?) Watch the newest video from Big Think: https://bigth.ink/NewVideo Join Big Think Edge for exclusive videos: https://bigth.ink/Edge ---------------------------------------------------------------------------
From playlist The Floating University Sessions | Big Think
Astronomy - Ch. 29: Galaxies (1 of 14) How Many Galaxies are there in the Universe?
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will learn how astronomers calculate how many galaxies are in our observable universe. Next video in this series can be seen at:
From playlist THE "HOW TO" PLAYLIST
Radius of observable universe | Scale of the universe | Cosmology & Astronomy | Khan Academy
Radius of Observable Universe. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/correction-radius-of-observable-universe?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Mi
From playlist Cosmology and astronomy | Physics | Khan Academy