Quoting "Eric S. Raymond" <e...@thyrsus.com>:
Is the CPU temp going to be a good approximation of what the clock sees,
though? I can think of several reasons to doubt it.
It's better than nothing, but it does have two limitations:
1. the CPU heats itself at a different rate than the surrounding
board, so it can be much hotter than the oscillator
2. the in-CPU temperature sensors tend to be low-ish resolution
For example, see the first two graphs:
https://blog.dan.drown.org/beaglebone-black-ntpgps-server-temperature-compensation/
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