What Moon age should I enter for a full moon?

Use about 14.77 days. A value near 0 represents a new moon.

What lunar distance represents perigee or apogee?

Perigee is about 363,300 km, while apogee is about 405,500 km.

Does lunar declination need a positive or negative sign?

Yes. Enter a signed value; this simplified model uses its absolute value.

Can this replace a port tide timetable?

No. It is an offline planning aid and does not provide port-specific tide times or heights.

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Tide and Lunar Distance Predictor

Estimate spring/neap tide forcing and lunar-distance amplification with a transparent offline planning model.

Details

What this tool helps you do

Combines lunar phase alignment, the inverse-cube effect of lunar distance, and lunar declination into an amplitude index. It is a planning aid, not a port-level tide timetable.

Execution

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Prepared example runs

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1 examples

Perigean new-moon planning window

A close new moon produces a high spring-tide forcing index relative to a 1 m local baseline.

<h2>Amplified spring tide</h2><p>Perigean spring-tide anomaly window.</p>

Inputs

Set the required fields, then run the tool.

4 options

SettingsAdjust formats, ranges, numbers, and modes.4

Moon age (days)numberRequired0 = new moon; about 14.77 = full moon.Lunar distance (km)numberRequiredPerigee is about 363,300 km; apogee is about 405,500 km.Lunar declination (degrees)numberRequiredUse a signed value; the absolute value affects this simplified model.Local baseline tidal range (m)numberRequiredTypical local range used only to express the result in metres.

Result

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Samples

Tide and Lunar Distance Predictor

What this tool helps you do

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Inputs

Result

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Examples

1. Perigean new-moon planning window

2. Compare a quarter-moon scenario

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