Have you ever thought about how much impact the sun and the moon have on our lives and professions, especially on those who live and work by the seaside? These two forces control high and low water, they also control when spring tides and neap tides occurs. When the sun and the moon pull in the same direction spring tide occurs. When the sun and the moon pull in the opposite direction spring tide also occurs. When the moon pulls athwart in the direction of the sun neap tide occurs.
When the sun and the moon pull in the same direction a new moon occurs, but when they pull in the opposite direction a full moon occurs. 

On the web, for example on YouTube, it is possible to find entertaining and useful information about the effects which the sun and the moon have on tides. It is also possible to find interesting videos of how the sun and the moon control spring tides and low waters and find explanations on why neap tides occur. This is a very intriguing subject matter which is fun to browse through. 

You Tube: Moon Cycles Effects on Tides

NASA: Tidal Forces on Earth

NASA: Tides and the Moon