✦AESTUS GRAVITATIONALIS

COORDINATA: NOAA CO-OPS StationsOBSERVED

COASTAL HYDRODYNAMICS · LUNAR GRAVITATIONAL TIDAL HARMONICS

NOAA Tide & Gravity Observatory

Empirical coastal ocean tide harmonics decomposing principal lunar semidiurnal (M2), solar semidiurnal (S2), and lunar elliptic (N2) constituents against verified water level gauges.

NOAA Center for Operational Oceanographic ProductsDiscipline: 02 // ASTRONOMIC

AESTUS GRAVITATIONALIS · GUIDED HYDROGRAPH

The Moon pulls. The coast answers.

Watch lunar, solar, and local coastal clocks resolve into one measured water level.

01 · LUNAR FORCE

The Moon pulls. The coast answers.

A tide is not a single wave arriving from space. It is the local water response to a changing gravitational field, shaped by the basin beneath it.

Station responseSemidiurnal

King tide range2.34 m

SELECT GAUGE · 8665530Charleston, Cooper River

DECOMPOSE METEOROLOGICAL RESIDUAL+0.20 m

ASTRONOMICAL ONLYSTORM RESIDUAL

Harmonic receiverCharleston, Cooper River

M₂12.42 h

lunar clock

S₂12.00 h

solar clock

N₂12.66 h

elliptic clock

Local amplification

Charleston, Cooper River

1.44×

Moon's principal gravitational bulge

The selected station and surge value are the source of truth for both curves.

The NOAA Tide & Gravity Observatory

Empirical coupling of lunar gravitational harmonics (M₂, N₂) against real-time hydrodynamic gauge measurements.

OBSERVED

Tide Classification

Semidiurnal

Mean Tidal Range

1.62 meters

Spring Syzygy Range

1.95 meters

Perigean King Tide

2.34 m (1.44x)

24-Hour Hydrograph: Astronomical Tide vs. Observed Water Level (Meters)

Astronomical Prediction Measured Water Level

Simulate Storm Surge Residual:+0.20 m

NOAA CO-OPS Live Station #8665530

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