Solar Eclipse in Tahiti, French Polynesia, July 11, 2010

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Archive for the 'Technics and sciences' Category

Tuamotu Islands

Author: Vaiana
21.05.2010
Rangiroa. (Copyright: Philippe Bacchet)

Rangiroa. (Copyright: Philippe Bacchet)

The largest of the Polynesian archipelagos includes 76 islands and atolls extending over more than 20000 square kms. Asleep for many years, now it has come back to life through the establishment of some 250 pearl farms and tourism based on rich scuba diving sites which make it a winning destination.

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How to catch the Sun?

Author: Vaiana
11.05.2010

Maui catching the sun

Maui is a key character of the Polynesian legends and cosmogony. He sometimes appears as a demi-god, a prophet or an ancestor. Stories narrating his extraordinary exploits are overspread nearly all the islands of the Polynesian triangle: New Zealand, Hawaii, Tahiti, Mangareva, Samoa and Tonga.

Maui attrapant le soleil - Bobby Holcomb

Maui attrapant le soleil avec un cheveu de Hina - (Copyright: Bobby Holcomb)

In Tahiti, the legend says that Maui caught the sun and forced him to slow down his race so that men and women can adequately feed themselves and complete their various works.

Upon creation of the world, the sun thought he received the bad part: since he considered he was the only one at work.
He looked with envy at people underneath on the ground, living quietly, and having rest… And as he was lazy, he decided to do the same!

“After all,” he told himself, “I am a god.”
“Men expect my coming and honour me, so I can do what I like!”

From now on, the sun rose up very late and rapidly crossed Tahiti’s sky to sink behind the island of Moorea, for a long, long night. And the earth was suffering badly.

There was not enough heat to warm up stones of ovens and not enough light to prepare meals.

Maui, a young warrior, saw the irritated lips of his bride, because she ate raw. When his sadness turned into anger, he decided to conquer the sun. He gathered the biggest creepers, the longest seaweed, and the strongest barks. When the pile was high as 5 men, he began to weave an extraordinary fishing net with creepers, seaweeds and barks. During the day he worked with the fast sun’s light, by night he worked underneath the starlight.

He had taken as main piece a long hair of his fiancée. The drowsy and hurried sun didn’t notice that the net was growing gradually.

As the trap was achieved, maui took advantage of the night. He threw the net on his shoulder and went up to the reef,  at the edge of the large hole through which the sun usually rose up from the sea. Then he waited.

Maui catching the Sun - (Copyright J. Boullaire)

Maui catching the Sun - (Copyright J. Boullaire)

After a long, long awake, he saw a light arose from the hole. The glow grew and coloured waves and clouds, it became more and more strong, more and more intense. The birds began to sing, and Maui knew that this light was the sun.

When the first rays were engaged in the hole, Maui threw his net, his huge net and covered the entire hole, trapping the sun. Realising he was prisoner, the latter struggled furiously, but the net held out. Twenty times he tried to escape into the sky. Twenty times he was pushed back. Twenty times he tried to return underground. Twenty times he was held back.

Then the sun began to warm up so intensely that the sea began to boil and the earth to crack, so strong that one to one, all links of the net burned. Seaweeds, creepers, pieces of bark … nothing withstood the immense flames… except the hair of the beautiful bride of Maui. The sun could jump, warm and swell; he was trapped by the neck and suffocated. It gradually lost its glare, and finally stopped, exhausted, defeated.

So Maui said:

- It’s me, Maui, I caught the sun.

And the sun was begging:

- Deliver me, Maui, I’m suffocating.

- NO! I won’t. You will remain tied forever because of the harm you did to my fiancee and my people. Their lips are burned by the raw saps and their eyes are full of night. You will remain a prisoner!

- Maui, if you do not set me free, I’ll die and if I die, neither you nor your people could ever live! Save me!

- Promise me first that our fishes and our vegetables will be cooked before the night!
- I promise!

Then Maui delivered the sun and the sun leaped into the sky.

Since that day the sun rises soon and sets late. It is so long in his race that we have time enough to cook fishes, vegetables and fruits and to eat three times a day before the night.

And sometimes when we watch the sunset, we can see, very quickly, a green thin net: it is the hair of the bride of Maui that was hanging there so that the sun never forgets his promise…

Source: HENRY Teuira – Tahiti to ancient times – Society Oceanists – Tahiti Heritage

Maui catching the sun-Illustration: Bobby Holcomb

What is an eclipse?

Author: Vaiana
07.04.2010

What is an eclipse?

Each planet of the solar system takes its brightness from the sun. A celestial object is partially or totally eclipsed when it is plunged into the shadow of another one, just in part or in totality.

What is a solar Eclipse?

A solar eclipse occurs on new moon. The moon passes between the Earth and the Sun, consequently it hides the Sun from an observer located on Earth, and casts its shadow on the surface of the earth.

By an extraordinary coincidence, the Moon which is 400 times smaller than the Sun is also 400 times closer. Thus, the apparent diameters of the two objects are almost identical to a terrestrial point of view.
The total solar eclipse happens when the moon is close enough to the earth and then totally hides the sun. This is the case of the upcoming total eclipse of July 2010.
The partial eclipse is when the Moon partly hides the sun out of the annular eclipses conditions.

An annular eclipse occurs when the apparent diameter of the Moon is smaller than the apparent diameter of the Sun, and therefore the moon does not hide the Sun completely. The visible part of the Sun takes the form of a bright ring shining around the dark disk of the moon.

Frequency of eclipses

As a minimum, four eclipses occur a year, with two lunar eclipses and two solar eclipses. The maximum number of eclipses is seven: two solar eclipses, and two lunar eclipses and for remaining, all combinations are possible.

The same eclipse repeats itself every 6585.3 days or 18 years and 10, 11 or 12 days according to the distribution of leap years. This period is called the Saros. With Saros, one can find the exact date of an eclipse that happened many centuries earlier, just as one can predict the following eclipse.

What makes an eclipse so exceptional is that it never occurs again by the next 370 years in the same place.

A Saros counts about 84 eclipses: 42 of moon eclipses and 42 solar eclipses. Most of them are partial eclipses. Moreover, as the moon is going far away from the earth of 3 cm every year away from the Earth each year, in hundreds of centuries, total eclipses will no longer exist.

(Source: CNES)