That they have opposite response to temperature changes is ... interesting!
So the main osillator varies over a range of about 100/18000? About 0.5%? That's not too bad.That they have opposite response to temperature changes is ... interesting!
Sadly it depends on temperature so much it is possible to determine temperature variations between night and day indoors hidden in my table drawer and so it is not possible to use it to some good time keeping without callibration to temperature.
Just to get a feel for the oscillator variation over temperature, does about 8 C variation over the duration of the test seem about right?