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> Right, but for a long time I've been polling two servers (ntp.astro and
> madhaus.utcs).  What I don't understand is the behaviour of the ntpdate
> command if two servers are queried, and the times reported differ by a lot

I'm not sure if it would be able to figure out which one was wonky
if you only query 2 servers. I'd think you'd need at least 3 in order
to figure out that one of them was bad.

> So this brings up the obvious question:  Besides the seemingly-reliable
> madhaus.utcs, and the perhaps-someday-reliable ntp.astro, is there some
> third system on campus that it would make sense to add to our lists of
> NTP servers to poll?

at stratum 1: ntp.on.canet.ca
at stratum 2: ferut.sys utstat gpu.utcc enfm.utcc ns.onet.on.ca

For real accuracy, you should run the xntpd daemon instead of ntpdate.