The tides in a harbor are caused by the gravitational pull of the moon and the sun on the Earth's oceans. As the Earth rotates, the ocean waters are pulled towards the areas where the moon and sun are directly overhead, causing high tides. At the same time, there are low tides in the areas where the moon and sun are not directly overhead due to the water being pulled away.
The water depth in a harbor varies between high and low tide because of the changing distance between the Earth and the moon as well as the Earth and the sun. When the Earth and moon are closest to each other, the gravitational pull is stronger, causing higher tides. When they are furthest apart, the gravitational pull is weaker, resulting in lower tides.
High and low tides occur twice a day in a harbor, typically every 12 hours and 25 minutes. This is because it takes approximately 6 hours and 12 minutes for the moon to move from directly overhead to directly overhead again, resulting in two high tides and two low tides in a 24-hour period.
Yes, the time of high and low tides in a harbor can change due to various factors such as the alignment of the moon and sun, the shape of the coastline, and the depth of the water. Additionally, the time of high and low tides can vary from day to day, so it is important to consult tide charts for accurate and up-to-date information.
The water depth at 12am and 6pm in a harbor can vary depending on the specific location and conditions. In general, the water depth at 6pm tends to be higher than at 12am due to the alignment of the moon and sun, which can result in higher tides during the afternoon. However, this is not always the case and can vary depending on the tide cycle and other factors.