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Weather & Water

Daylight

Technical visualDaylight window
Daylight windowA sun arc crosses a horizon between labeled sunrise and sunset points.SUNRISESUNSET
Daylight windowA sun arc crosses a horizon between labeled sunrise and sunset points.121SUNRISE2SUNSET

Check the local date and position.

Daylight is bounded by local sunrise and sunset; twilight and changing conditions still require appropriate lights and lookout.

For trip planning, useful values include:

sunrise

sunset

civil twilight

total daylight

For Navigation Rules lights, however, the core legal period is sunset to sunrise, with lights also required in restricted visibility and other circumstances prescribed by the Rules.

Do not substitute civil twilight for the Rule 20 requirement.

7. KNOTS

These tying sequences are deliberately deterministic so they can be rendered as step-by-step SVG sequences.

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