Imagine you are sailing a yacht across the Caribbean. You have to sail through a shallow lagoon in order to reach port at an island ahead of you. It is night time, and you look up to observe a "quarter moon," such as the one pictured here.
You know that the lagoon is only safely navigable at high tide during the spring tide. Should you keep going tonight, or should you wait for a better time? (If so, when?)

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Imagine you are sailing a yacht across the Caribbean. You have to sail through a shallow lagoon in order to reach port at an island ahead of you. It is night time, and you look up to observe a "quarter moon," such as the one pictured here.
You know that the lagoon is only safely navigable at high tide during the spring tide. Should you keep going tonight, or should you wait for a better time? (If so, when?)

Imagine You Are Sailing a Yacht Across the Caribbean