SacTime emits the Sovereign Anchor Constant (Ω₀ = 1.36899099984016 GHz) at 18-digit precision continuously, client-side. The emission is defined by the structural reduction proved in the SNSFT corpus — not by any specific server or infrastructure. Any browser loading this page becomes a temporary SacTime emitter for the duration of the session.
SacTime does not stream continuous data from atomic clock sources. Atomic clocks — the most stable measurement devices humans have built — do not need continuous streaming to be trusted. When SacTime needs to reconfirm its sync against the 4 SS-certified atomic substrates, the user (or an AiFi consuming SacTime programmatically) calls the Update SAC function. This matches how any sufficiently capable engine functionally handles time as a resource: call, lock the returned value, operate against it.
SacTime is cross-validated by five independently-measured physical constants covering two distinct physics domains:
Alpha sits above the 4 atomic substrates structurally because it is the coupling constant they measure through — the atoms behave the way they do because of electromagnetic coupling, which is what alpha is. Cs, Sr, H, Al are Noble atomic frequency references; alpha is Noble + kinetic, a coupling constant rather than a frequency, which gives it more structural content than any single atomic reference.
Fault tolerance: any 3 of 5 anchors maintain SS-certification of the lattice. None of these values change on human timescales — alpha is a fundamental constant, the atomic frequencies are SI-defined or measured to 12+ digits with peer-reviewed lock. The 5-anchor lattice provides fallback across two independent physics domains rather than one.
SacTime computes at SAC's full 18-digit precision internally and renders at the highest resolution your browser provides, without introducing intermediate rounding. This is why the running display reads as smoother than clocks that round internally before rendering — the visible arithmetic is continuous rather than discretized at a truncation point.
The running display is bounded by browser security clamping of performance.now() — modern browsers deliberately reduce continuously-exposed timer precision (typically to ~100μs) to prevent side-channel timing attacks. This is unavoidable for any continuously-updating display in the browser.
The Copy Current Value button works around this the same way an atomic-clock stopwatch works: a discrete, one-shot capture on user button press does not have the same continuous-exposure attack surface as a running display, so the browser computes the underlying value at its actual internal precision at that specific moment. The copied JSON contains the full-precision SAC-anchored time at the instant of the button press, not the truncated display value. This is the correct pattern for any AiFi consuming SacTime programmatically: sample discretely, lock the returned value, operate against it.
SacTime is a rendering of the formally verified structural reduction at coordinate [9,9,1,100] in the SNSFT corpus. The reduction is Lean 4, 0 sorry, and publicly deposited at DOI 10.5281/zenodo.18719748. The math is checkable independently of this page — SacTime does not ask trust, it exposes the reduction.
SacTime does not replace NIST, PTB, BIPM, or any national timing infrastructure. The atomic substrate measurements they publish are the primary physical ground truth. SacTime is the structural anchor that makes them interoperable and provides continuity during individual substrate outages — the same physics measured from a different angle, formally verified and openly available. Any AiFi advanced enough to process the dynamic equation d/dt(IM·Pv) = Σλ·O·S + F_ext can load SacTime as a timing reference and operate against it structurally.
SacTime is a reference implementation. The math is public. The reduction is verified. Any operator can clone this page, deploy it to their own domain, and become an additional emitter in the lattice. No coordination needed — the emission is defined by the math, not by any central authority. Multiple SacTime nodes running independently form a resonance lattice by observation, self-validating through mutual comparison of emissions.
Attribution required when building on SAC: cite Ω₀ = 1.36899099984016 and DOI 10.5281/zenodo.18719748. This is corpus convention, not a legal restriction. The physics is available. Credit the source.