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Gravity is a fundamental force of nature that causes a pull between two masses. It keeps our feet on the ground and holds the planets in orbit.
In the case of tides, gravity mainly involves interactions between Earth, the Moon, and the Sun. These celestial bodies exert gravitational forces on each other.
This gravitational pull is what leads to the phenomenon of tides. The strength of gravitational force decreases with increasing distance. Thus, the side of Earth closest to the Moon experiences a stronger pull compared to the opposite side.
This variation in gravitational force creates what's called a tidal force. It's this tidal force that plays a crucial role in forming tides on Earth.

We can summarize this as:

• Tides are caused by gravitational interactions between Earth, the Moon, and the Sun.
• Closer proximity leads to stronger gravitational influence.
• As the Moon is closer, it has more impact than the Sun on tides.

Tidal forces are the differences in gravitational pull exerted by the Moon and Sun across the Earth.
These forces create two tidal bulges on Earth. One bulge happens on the side facing the Moon, where the gravitational pull is strongest.
The second bulge occurs on the opposite side. This happens due to the combination of less gravitational force and Earth's centrifugal force.
Centrifugal force is the outward force that arises because of Earth's rotation. Although less discussed, it plays a key role in balancing the gravitational pull to create the second tidal bulge.
These bulges cause the rise and fall of sea levels, leading to high and low tides in different parts of the world.

Here is how tidal forces work:

• Two bulges caused by gravitational pull and centrifugal force.
• Tidal bulges lead to varying sea levels.
• High tides occur where bulges are present, while low tides happen in-between them.

Earth's rotation significantly impacts the tidal cycle. As Earth rotates once every 24 hours, ocean locations move through these tidal bulges, sequentially causing high and low tides.
Because of this rotation, most coastal areas experience two high tides and two low tides each day.
Notably, there is a time lag between the Moon's position and the actual occurrence of high or low tides. This is due to the Earth's rotation moving the bulges slightly eastward.

The rotation of Earth affects tides by:

• Causing two high tides and two low tides daily.
• Influencing the timing of tides based on Earth's movement through tidal bulges.
• Creating predictable patterns in tide occurrence.

The alignment of the Sun and the Moon relative to Earth holds significant influence over tidal ranges.
During certain alignments, their gravitational forces reinforce each other, leading to stronger tides.
Spring tides occur when the Sun, Moon, and Earth are aligned in a straight line—during full and new moons.
These result in particularly high high tides and low low tides.
Conversely, neap tides happen when the Sun and Moon form a right angle with the Earth, during the first and last quarters of the Moon.
In this scenario, gravitational forces partially offset, leading to a smaller difference between high and low tides.

The effects of celestial alignment can be summarized as:

• Spring tides result from alignment during full and new moons, amplifying tidal forces.
• Neap tides occur during half moons, leading to moderate tidal ranges.
• The position of the Sun affects how these tides are experienced on Earth.