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Hi,
Public AWS documentation mentions satellites and atomic clocks in each regions, but not specifically the atomic clock of NIST. See
Amazon Time Sync Service, a time synchronization service that is delivered over the
Network Time Protocol (NTP), was launched in November 2017 to help instances
maintain accurate time. Amazon Time Sync is used by EC2 instances and other
AWS services. It uses a fleet of redundant satellite-connected and atomic clocks in
each Region to deliver time derived from these highly accurate reference clocks.
This service is provided at no additional charge. It is available to all EC2 instances i
n all AWS Regions and the AWS GovCloud (US) Regions.
See https://aws.amazon.com/about-aws/whats-new/2022/11/amazon-time-sync-internet-public-ntp-service/ for a recent confirmation
Best,
Didier
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