Rainbow Fire

A circumhorizontal arc or rainbow fire is an atmospheric optical phenomenon shaped like a rainbow halo but differs in that it shorter, thicker and is a not caused by the refraction of light in water droplets but though ice crystals in cirrus clouds.

It occurs only when the sun is high in the sky at least 58° above the horizon and can only occur in the presence of cirrus clouds. Therefore it can not be observed at higher latitudes 55° except occasionally from mountains.

The phenomenon is quite rare bacause the ice crystals must be aligned horizontally to refract the high sun.

A circumhorizontal arc can be confused with a infralateral arc when the sun is high in the sky; the first is always oriented horizontally while the latter is intended as a section of a rainbow, such as arc stretching above the horizon.

What do you think about rainbows of fire?

I think it is a beautiful phenomenon and also it´s nice to see because of their colors.

SCIENTIFIC CURIOSITIES

1) The astronauts can not burp because weightlessness does not allow the separation of liquid and gas in their stomachs.

2) The palm talipot takes 100 years to bloom and then dies.

3) Without its layer of mucus, the stomach digest itself.

4) Lightning can reach up to 30 miles (48 km) long and its thickness is less than an inch (2.54 cm) and reach a higher temperature than the sun's surface.

5) An electric eel can produce a shock above 600 volts.

6) Light takes 8 minutes and 17 seconds to travel from the sun to the Earth's surface.

7) A human heart beats 100, 000 times a day, throughout his life a human blood pumped so as to fill 100 swimming pools.

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PIRATE SHIPS

Were as pirate ships?

Pirate ships were to be swift, well-armed and low keel to sail close to the shore when they attacked the coast. The tripulacione was more numerous than those of merchant ships often, so many of their ships could be crowded.

The pirates were engaged in stealing and the more the better. Their prey were usually heavy merchant ships, laden with all kinds of riches.

To be able to catch they used light boats, since they do not transport goods, unless the stolen loot.

And the speed was essential for them, much of his time was devoted to the preservation of the ship.

Not begin too large ships and not wanting to take too much weight, evoiding heavy guns. Most of their guns were light and used mainly to clear the cover of the ship assaulted.

Most common types of vessels:

1) BARQUE: Ship widely used by pirates and privateers, for its speed and medium size about 80 tonelas.

2) BALANDRA: Used by the filibusters by its speed.

3) PINNACE: Very fast especially to transport of pirates to the ship or area to attack.

4) MAN OF WAR: English construction equivalent to the spanish galleon, a large as 800 tons.

5) CANOE: In shallow draft it was used to shallow water

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