Register 14 · Time & cadence

Meridian crossing.

Meridian crossing — a reference page in the Time & cadence register.

Open the Console See how a record is checked
register 14 · Time & cadence· reference mark
01 ·

Promise. atom

The contract this mark binds — derived, not asserted.

Meridian crossing — a reference page in the Time & cadence register.

Answers: What is Meridian crossing in the Planisphere corpus library?

02 ·

What this is.

twelve marks · when measurement happens · same construction · 200×200 · integer geometry · currentColor + brass-deep

Use. sun across the local meridian.

Source. horizon + sun overhead + brass meridian line.

Register. 14 · Time & cadence — one of the 17 registers of the PLANiSPHERE corpus library.

03 ·

See it work.

Evidence record you can check — not code you have to trust.

Planisphere measures your tool deployment against Meridian crossing and seals the result into a signed, Merkle-rooted evidence record. The grade recomputes on your own hardware; the model state never crosses the boundary.

Check whether our model changed →See how a record is checked
04 ·

The board that carries this.

Related marks, and the surface this one funnels to.

Meridian crossing is a reference mark in the Time & cadence register. Read the related buyer-facing product context at /evidence.

Calendar reg 14 · days on a grid Epoch boundary reg 14 · before-and-after partition Escapement reg 14 · gear teeth + anchor pallet Half-life curve reg 14 · exponential decay marking the midpoint
05 ·

Routes here from.

Where this mark is referenced in the Planisphere surface.
About

Any internal link in the Planisphere site that names "Meridian crossing" canonicalises here.

06 ·

Sibling marks. Time & cadence

Same register · same construction.
Sundial
gnomon casts shadow on the dial
half-circle dial + gnomon + brass shadow
Hourglass
sand falling through the waist
two triangles + brass falling sand
Escapement
gear teeth + anchor pallet
circular gear with teeth + brass pallet
Atomic clock
cesium hyperfine transition
nucleus + 3 elliptical electron orbits
Calendar
days on a grid
5×5 grid with one brass day marked
Epoch boundary
before-and-after partition
vertical brass line + before/after dots
Tick mark
one increment on the ruler
ruler + one prominent brass tick
Solstice line
sun at its furthest from the equator
horizon + sun at extreme + brass extreme indicator
Julian day count
continuous day-numbering
number-line + brass index
Planck tick
the smallest meaningful interval
tiny dot + brass magnifying-frame around it
Half-life curve
exponential decay marking the midpoint
axes + curve + brass half-mark

See the record Meridian crossing asks for.

The console shows the evidence; the docs show the endpoints; the briefing shows what the product does and does not claim.

Open the Console Read the Docs Read the capability briefing
API ·

When a regulator asks for proof, hand over records — not assurances.

record the duty · seal the receipt · verify offline

Planisphere records each duty event — an output marked, a disclosure shown, a review made — and seals it into a receipt that verifies offline against our published keys. You send hashes, never content. A record is evidence a third party can check; it is not a certification and not a legal determination.

Open the Console Read the Docs Read the capability briefing

See how a record is checked