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time.windows.com, time.apple.com, and time1.google.com are all publicly accessible.

Apple's one is also available at time.asia.apple.com and time.euro.apple.com

windows and apple tend to keep terribly inconsistent time, though, and windows time goes nutso at leap smears.

Do you have a citation for this? I've been monitoring NTP servers for years and Apple's are among the closest to my GPS reference.