The Big Players put atomic clocks in the datacenter, and provide multiple mechanism's of time synchronization. Google Spanner was the first to do this, back in.

The Big Players put atomic clocks in the datacenter, and provide multiple mechanism's of time synchronization. Google Spanner was the first to do this, back in... 2007? https://www.theverge.com/2012/11/26/3692392/google-spanner-atomic-clocks-GPS https://www.theverge.com/2012/11/26/3692392/google-spanner-a... https://cloud.google.com/spanner/docs/true-time-external-consistency https://cloud.google.com/spanner/docs/true-time-external-con... Now, I don't think they worry overmuch about general or special relativity at this point, but if we start putting datacenters in orbit that will become an actual issue. I'll wager we'll start seeing Edge Compute and CDN features on the very large satellite constellations (Starlink, etc) soon. Initially this will preserve bandwidth between satellites and with the ground stations. This will be a big upsell feature. The Quant folks would pay more for those sweet low-latency links...