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if they have to be exactly in Sync, i would recommend networking the machines together and using Michel's SyncVideo actor. you could then trigger them at any time.
My clock uses the code I outline here: http://www.dusxproductions.com/blog/javascript-based-orbits-in-isadora/ To control the orbit/rotation of the hands, and placement of the numbers. You can see a little more creative use of the same 'orbit' code here: https://m.youtube.com/watch?v=usai4ugQwRU