WHY can electronic clocks lag?

The “heart” of an electronic clock is a frequency oscillator with a crystal quartz plate fluctuating in it. It is adjusted so that the clock runs exactly at room temperature (about 25 °C).

As the temperature deviates from this point, the oscillation frequency decreases and the watch lags (up to a few minutes per year). The more expensive models use a temperature-compensated quartz, with which the error does not exceed a few seconds per year.

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