What latitude parallel marks the boundary for guaranteed daily Moon rise and set?

Answer

$61.5^ ext{circ}$ South or North.

The critical demarcation line for whether an observer is guaranteed to see the Moon rise and set daily is the $61.5^ ext{circ}$ parallel of latitude, both north and south. This value is derived directly from the Moon's maximum northern declination, which is approximately $+28.5^ ext{circ}$. The calculation used is $90^ ext{circ} - 28.5^ ext{circ} = 61.5^ ext{circ}$. Any location situated poleward of this line will experience periods where the Moon cannot climb high enough above the horizon to clear the line of sight due to its southern extremes during orbit. Conversely, at or below $61.5^ ext{circ}$, the Moon always rises and sets daily, even if obscured by phase (like being up during the day during the New Moon).

What latitude parallel marks the boundary for guaranteed daily Moon rise and set?

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