Which tide occurs when the sun and moon are at right angles to each other?

• A. Spring Tide
• B. Neap Tide
• C. Semi-Diurnal Tide
• D. Diurnal Tide

Answer: (B)

The occurrence of a neap tide is attributed to the alignment of the sun and moon at right angles to each other, which significantly affects the gravitational forces acting on the Earth's waters. During this arrangement, the gravitational pull of the sun partially offsets that of the moon, resulting in lower high tides and higher low tides. This phenomenon creates a smaller tidal range compared to spring tides, which occur when the sun, moon, and Earth are aligned, maximizing gravitational effects. Neap tides typically happen twice a month, specifically during the first and third quarters of the moon. Thus, the correct answer reflects the distinctive interplay of gravitational forces at this particular configuration of celestial bodies.