Insolation is composite of three orbital cycles: eccentricity, obliquity, precession. It affects global temperature. In turn global temperature affects absolute global sea-level.
Shoreline-trajectory is path of shoreline locations. It records sea-level relative to continent. Naively assuming continent static it represents global sea-level.
Dashboard : plot 1
Insolation-curve can be modified for three composing signals. This is true-signal.
Samples are taken randomly from insolation-curve and evenly spread along time. This is apparent-signal
Dashboard : plot 2
Fit is division of apparent-signal baseline-crossings / true-signal baseline crossings.
Simulations are run for range of sample-rates and logistic-curve calculated.
Conclusion: fit of shoreline-trajectory to sealevel-curve is logistic function of sample-rate
| Samples | Fit |
|---|---|
| ~10 | 0.1 |
| ~40 | 0.5 |
| ~200 | 0.9 |
Dashboard : plot 3