Sunrise/Sunset Calculator

Calculate sunrise, sunset, and twilight times from latitude and date for passage planning

Input Parameters

Results

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Sunrise (local)
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Sunset (local)
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Day Length
hours
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Nautical Twilight Start

Reference

Solar Declination ≈ 23.45° × sin(360/365 × (DOY-81)) Hour Angle: cos(HA) = -tan(lat)×tan(decl) Nautical twilight: sun 12° below horizon Day length = 2×HA/15 hours