Perigee refers to the point in the Moon's orbit where it is closest to Earth. This happens roughly every 27.5 days.
Spring tides are exceptionally high high tides and low low tides that occur roughly twice a month.
Here's the key difference:
* Perigee is about the Moon's position in its orbit around Earth.
* Spring tides are about the combined gravitational pull of the Moon and Sun on Earth's oceans.
How they relate:
* When the Moon is at perigee and the Sun, Moon, and Earth are aligned (during a new or full moon), the combined gravitational pull is stronger, leading to higher spring tides. This phenomenon is sometimes called a "perigean spring tide."
In summary:
* Perigee is a point in the Moon's orbit.
* Spring tides are a tidal phenomenon caused by the alignment of the Sun and Moon.
* Perigee can contribute to higher spring tides, but they are separate concepts.
