Saturday, June 13, 2015

Leap second FPS

Isn't this an important question?
what is the frame rate we use or do we just treat it like any other second?
  1. leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time, or UT1. 

    Leap Second - What is it? - Time and Date

    Time and money for. The fact Date › Time Zones
    Mobile-friendly - leap second will be added on June 30, 2015 23:59:60 UTC. A leap second is a second which is added to Coordinated Universal Time (UTC) in order to synchronize atomic clocks with astronomical time to within 0.9 seconds.

    A leap second will be added on June 30, 2015 23:59:60 UTC.
    Illustration image
    Atomic clocks are slightly too accurate. 
    A leap second is a second which is added to Coordinated Universal Time (UTC) in order to synchronize atomic clocks with astronomical time to within 0.9 seconds. 

    Why Do We Need Leap Seconds?

    The reason we have to add a second every now and then, is that Earth's rotation around its own axis, is gradually slowing down, although very slowly.
    Atomic clocks however, are programmed to tick away at pretty much the same speed over millions of years. Compared to the Earth's rotation – which determines the length of a day – the atomic clocks are simply too accurate.

    How Often Are Leap Seconds Added?

    Did you notice? The last leap second was added at 23:59:60 UTC on June 30, 2012.
    Since 1972, a total of 25 seconds have been added. This means that the Earth has slowed down 25 seconds compared to atomic time since then.
    This does not mean that days are 25 seconds longer nowadays. Only the days on which the leap seconds are inserted have 86,401 instead of the usual 86,400 seconds.

    Leap Second 2015

    Click on Corresponding times to find out when the leap
    second is added to the time at your location.
    UTC DateUTC TimeLocal time world-wide
    2015-06-3023:59:57Corresponding times
    2015-06-3023:59:58Corresponding times
    2015-06-3023:59:59Corresponding times
    2015-06-3023:59:60Leap second added
    2015-07-0100:00:00Corresponding times
    2015-07-0100:00:01Corresponding times
    2015-07-0100:00:02Corresponding times

    36 Seconds' Difference

    The difference between UTC and the International Atomic Time (UTC-TAI) after the next leap second has been added on June 30, 2015, will be 36 sec.

    are they ever going to match up?

    Who decides when to add leap seconds?

    The International Earth Rotation and Reference System Service (IERS) in Paris, France observes the Earth's rotation and compares it to atomic time. When the difference between the two approaches 0.9 seconds, they order a leap second to be added worldwide.
    Check our Time Zone News for updates about leap seconds.
    Topics: TimekeepingClocksHistory