If the fix is right,
the sky and gravity agree.
This page uses real celestial and tidal-gravity equations to show the inverse of navigation: given a time and location, the Sun, Moon, and local tidal field should resolve into one coherent physical picture.
Real Sun / Moon geometry
Tidal acceleration model
Real world coastlines
Drag globe · click to sample
Observer position
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Tap “Use my location” for a local computation.
UTC
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Live clock driving the current geometry.
Combined tidal signal
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Sun + Moon tidal acceleration at the observer.
Integrity story
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When position is correct, independent observables align.
🌍 Drag the globe to spin it · click anywhere on it to sample the live gravity field there
Live observer controls
Use real location, or stay on demo coordinates
Default coordinates start near Boston Harbor for demo continuity. Switching to your location recomputes the Sun, Moon, and tidal signal in real time.
Demo position
Conceptually: a spoofed RF fix can assert coordinates, but it cannot easily force
celestial geometry and the local tidal field to tell the same lie simultaneously.
Live components
Sun contribution
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Moon contribution
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Map view center
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Drag the globe — it also drifts on its own.
Gravity phase cue
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Illustrative alignment indicator.
The globe below renders real coastlines from world map data, rotates with a live drag,
and keeps spinning gently on its own — while the underlying Sun/Moon positions and
tidal calculations stay physically live throughout.
Sample gravity anywhere
Click a point on the globe
Pick any coastline or ocean point on the globe above to see its live tidal-gravity signature —
independent of the observer position used elsewhere on this page.