Building A More Accurate Time Service At Facebook Scale
Facebook Engineering, March 20th, 2020
March 20, 2020,
Volume 264, Issue 3

Almost all of the billions of devices connected to the internet have onboard clocks, which need to be accurate to properly perform their functions

"Many clocks contain inaccurate internal oscillators, which can cause seconds of inaccuracy per day and need to be periodically corrected. Incorrect time can lead to issues, such as missing an important reminder or failing a spacecraft launch. Devices all over the world rely on Network Time Protocol (NTP) to stay synchronized to a more accurate clock over packet-switched, variable-latency data networks..."

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