The majority of folks believes that tides are induced by the Moon. This is an undeniable fact. Nonetheless, not only this gravitational "pull" is answerable for this. One should also mention rotation of the Earth. It is not mentioned so often, but it definitely plays essential part here.
Taking a look upon the diagram that is on the left, one can see how the gravity does its job.
The Earth rotates on the axis each 24 hours. The moon could possibly be overhead and underfoot during these 24 hours for two times. This would make 2 high and low tides. Nevertheless, as we know, its orbit is moving. Accordingly, it takes 24 hours plus 50 minutes so that this body was in the position of overhead. Thus, time between two periods is 12 hours and 25 minutes.
"Spring" tides appear in that very moment when our planet gets in one line with two great stars, which are of big importance for us. Of course, these are sun and moon. Mind that here "spring" is not referred to one of the seasons of the year. Many who thinks that the movement of great amounts of water require a lot of time. Notwithstanding, it is not so. The spring tide take place in some two days after the novice moon.
During the period of the total alignment of the stars, their energies get sustained and they are capable to create high tides. Mark that when the orbit of the moon is in its closer positioning to our planet, they enhance and consequently, their energies influences upon the things in our world become more obvious and stronger.
The forces get exerted from various paths. In such situation, there are differences in the strength. High tides would be lower than statistical average, while the lower ones are higher than commonly. This type of tides is called "neap". Under this word, scholars mean "small".
Other Factors and Facts
Mind that there are different forces that reign in the universe. Many things have importance in the processes that take place in our life. They carry their own strengths and induce certain effects.
In certain areas, the tides’ influence is stronger. They are called double-high and double-low waters. The highest tides take place in Canada (17m).
There exists a common thought that the area of Mediterranean Sea has no tides at all. This is almost true. To speak more correctly, they exist in that region as well. Nevertheless, they are frequently overseen, because of different atmospheric conditions. They greatly disturb noticing the presence and powers of the tides. The smallest tides were indicated in the Adriatic and South of Sicily.