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Why is the change measured over 24h and not since midnight?

Because crypto never closes. There is no opening bell to count from, so the ticker’s data source, and every figure on the glass, uses a rolling window: always the last 24 hours counting back from this moment, not "since midnight".

One coin’s screen with its 24h percent change and a 24h chart, both counting back from right now

The same holds for the charts: every range counts back from right now. See Price area.