Why aren't Kaspa's halving phase dates fixed on the calendar?

Kaspa halving phase dates are estimates, not guaranteed calendar dates, because each phase begins when the network hits a specific DAA score value rather than a set clock time. The DAA score is a cumulative measure of mining work done by the network. When the total hashrate across all miners rises or falls, the pace at which blocks are produced changes too — and since blocks drive the DAA score upward, a surge in miners means the score climbs faster than predicted, while a drop in miners slows it down. For a beginner tracking Kaspa's supply emission, this means published phase-start dates are useful approximations but can land earlier or later depending on how much mining activity the network sees.