Spring tides occur when the Sun and Moon line up, since the gravities of the two bodies add together to create larger tidal forces. Neap tides occur when the Sun and Moon are at right angles to one another as seen from Earth. In this case, the gravitational forces counteract each other, creating weaker tidal forces.

Rear Adm. Harry Hill, put in command of the amphibious force, consults with local mariners and reaches a cautious consensus that neap high tide in the lagoon on November 20 will surely be close to five feet deep.

... and neap tides (tides that occur during the first and third quarters of the moon and that have the least difference between high and low tides), ...

Neap tide

Meaning

Noun

Antonyms