The Caribbean current flows through the Yucatan Strait and flows into the Gulf of Mexico to form a clockwise current, flowing out of the Florida Strait and entering the Atlantic Ocean, becoming the starting section of the Gulf Stream.

The Gulfstream brings vitality to the entire Florida coastal waters.

This seabed belongs to the under-tide sea area, which is the underwater shore slope outside the intertide shallow.

Due to frequent wave action, abundant bait from land and continental shelf, coupled with abundant sunlight and oxygen in tropical areas, breeding and enriching seabed benthic organisms.

Corals are everywhere, fish are in groups, algae clusters and sea leeks are growing.

Li Ming's dive was in vain. In his pocket, five sea cucumbers and a fierce-eyed lobster that had just been pulled out of the cracks of the rocks by him;

Looking back, he finally looked at the sea cucumbers that were too many to count on the stones under the sea. He couldn't help but sigh that such a picture was the ambition of the anchor who drove the sea!

Many viewers with diving experience in the live broadcast room joked about his food waste behavior.

When he waited for his water and grass land, Li Ming used his hand to open the metal detector and tried it.

really!

The signal prompts that something is under the seabed, and waits until he determines the strongest position of the signal;

Next, Li Ming decisively used the magic of digging a hole to slam the gravel on the seabed into a big hole. When the raised sea sand dissipated, the things lying in the hole were beyond his expectations.

On a white sea sand, a hollow disc-shaped metal object was lying quietly there, and the strange double-headed pointer on the hollow disc was already very corroded.

The whole thing that Li Ming discovered was covered with a layer of green rust and calcified mud shell, and there was also a thumb-sized buckle on the edge of the hollow disc.

Anyone will think it is extremely exquisite when they see this thing at first sight.

Moreover, this thing is not small, the light diameter must be more than 30 cm.

Li Ming recognized what the metal disc in front of him was just a glance, and he was so excited!

Because it is so important that this thing appears in this sea area, but the water friends in the live broadcast room don’t know it, so they ask for various solutions and popular science.

Li Ming deliberately kept it a secret.

"Brothers, you might as well guess what this is?"

Suddenly, the audience made all kinds of interesting speeches, such as parts on the cannon and fishing items, only the conclusion of the compass was slightly slight.

Obviously, most viewers were unfamiliar with things, and soon the screen of question marks began to lift their swords and swept the screen.

Li Ming smiled and excitedly picked up the metal disc in the pit and explained: "The name of this thing is the starfish disk! In the era of magnificent waves a few hundred years ago, this was a must-have thing for every ship!"

Many viewers know about the sextant and navigation clock used for navigation, but the audience is amazed at the live broadcast room of the "Starboard" .

In many people's perception, aren't the astrology chart used by many fortune tellers to create zodiac signs, fortunes, and horoscopes?

Some people even think this thing is useless, and it is like a joke compared to GPS.

Seeing that everyone in the live broadcast room didn't care much about the things, Li Ming said with a serious expression:

"Before the opening of the Age of Discovery that influenced the history of human civilization, the astrology was indeed a tool used by astronomers and astrologers to observe astrology."

"The history of the astronomy used by ancient human astronomers began in ancient Greece, and the astronomy of the Arab world developed highly in the 9th century."

"And there are records in the *** religion that the astrology is very precious!

“Because it helps determine the time of prayer determined in astrology and helps the pilgrims find the direction to Mecca, the most sacred city of the *** religion.”

"For centuries, astrodiameters were considered one of the basic astronomical education tools, and the early astrodiameters used to observe astronomical phenomena were made of brass or even wood."

At this time, the thing that was catching the starfish plate from the sea sand in Li Ming's hand should belong to the early 17th century. He looked through it and found that there were some blurry inscriptions and patterns on it, but it was not clear due to the corrosion of sea water.

“The nautical star plate was the simplified version of the traditional astronomical star plate when it was the most primitive;

Its creation and perfection are attributed to the Portuguese navigators, who promoted the use of the astronomy, indirectly promoted the significant expansion of human navigation, and also created the glory of Portugal for centuries."

"So according to statistics, almost one-third of the known starfish disks were made in Portugal in the 16th and 17th centuries..."

"The astrolae used by sailors is usually made of brass or iron."

"Because they are heavy and strong enough to be used on moving ships, the captain can measure latitude more accurately."

The starfish disk is an instrument that can help the captain and sailors judge time and find altitude and latitude;

"In actual use, we use it to measure the height of the sun or stars on the horizon, and together with star charts and star charts, observers can find their latitude."

"Once a navigator finds the latitude line and sails east or west along the latitude line, you can reach your destination. Although a starfish disk is a very practical tool, this starfish disk also has its disadvantages."

“For example, it is not always an exact tool at sea, as it is difficult to keep it stable on a swaying boat and in strong winds. This can lead to degree errors, which will cause ships to deviate from the channel.”

"But before the sextant and navigation clock were invented, this was a must-have artifact for navigators!"

"The reason why Europeans could sail around the world by relying on compass is not the compass, but the astrodiameter, navigation clock, sextant, and star chart."

"For example, the premise of using a compass to navigate is that we have to have a map in our hands. Without a map, we cannot navigate without a compass.

There are also times when you don’t know when and where you are. The compass can only tell you the direction, but not where you are now!"

"If you are in the vast ocean, it would be useless to give you navigation charts and compass, because you don't know where you are!"

"So it is necessary to calculate the latitude and longitude through time combined with the positions of stars in the sky and then navigate, and this technology has matured hundreds of years ago."

......

The appearance of the sailor's astrological chart really surprised Li Ming, because it was one of the essential things for ocean-going sailing hundreds of years ago. Without this, it would be almost impossible to cross the dangerous North Atlantic Ocean.

It indirectly proves that there are indeed ships sinking here in the entire sea area. This thing should be that after the waves smash the ship, they are washed away by the waves and ocean currents, and finally submerged under the sea sand.
Chapter completed!