ntp.aquarat.co.uk
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A stratum-1 time server in the UK: a Raspberry Pi 4 with a u-blox GPS receiver and its pulse-per-second
output, running chrony. It serves time to the public through the
NTP Pool — use pool.ntp.org rather than this name, which only serves this page.
The figures below are copied from the server every few seconds; the server itself never answers web requests from the internet.
Status
Receiver
Sky
Signal strength (dB-Hz)
chrony sources
| State | Source | Stratum | Poll | Reach | Last rx | Offset | ± Error | Std dev |
|---|
History · shaded band = min–max per point, line = average
PPS stability
Allan deviation
Overlapping ADEV of system clock vs PPS edge (phase data, τ₀ = 1 s). Log–log.
Table
| τ | ADEV | Samples |
|---|
PPS offset distribution
Per-pulse offsets over the last hour (0.5–99.5 percentile range).