What do we call tides that occur at or soon after the new or full moon?

Tides that occur at or soon after the new moon or full moon are classified as spring tides. This phenomenon occurs because, during these phases, the gravitational forces of the moon and the sun align, resulting in higher high tides and lower low tides compared to other times in the lunar cycle. The increased gravitational pull helps to create a larger difference between the high and low tides, hence the term "spring," which refers to the "springing forth" of the tide.

Spring tides typically happen every two weeks, alternating with neap tides, which occur midway between the new and full moons when the gravitational forces of the moon and sun are not aligned, resulting in less variation in tide levels. Understanding this aspect of tidal cycles is essential for navigational purposes and for activities such as fishing, boating, and coastal management.