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Why the moon is shown with different forms? CF No. 176

SCIENCE EASY N º 176

Author: Mary Cristina Chaler.

Series

Juguemos to why?
Why the moon is shown with different forms?
Great inspiring poets and romantics the moon was a mystery and source of legends.

"Companion of the planet forever?
There are several theories about this, some associated with the moon and the earth a common origin, others explain that it was actually drawn at some point on the earth or that it is an evolution of the planet and the most accepted to date is formed after an enormous impact on the earth by another celestial body.
is classified as a natural satellite that is orbiting the planet in the translation came around the central star (sun). It is one of the larger satellites of the solar system and even see it shine, do not have their own light, only see the reflection of light from the sun and as the rotation (spin on its axis) is in sync with your translation always see the same face. This appeared to be casual and repeated in several of the satellites of our solar system.
We will all see the different ways in which the moon appears in the sky. These shapes are called phases and depend on the position that the moon relative to the sun and the earth.

As the earth revolves around the sun and the moon makes around the earth, the positions adopted against sunlight may be as follows
T (ground) ---- L (moon) --- - S (sol) from the land where we see the dark side and the bright faces the sun, this is the so-called invisible new moon phase. That it is invisible to our eyes.
When away from that position with clockwise rotation is placed
T ------ S began to see the new moon rising in our
L
southern hemisphere appears as a wide small letter C fine, that letter is slowly growing into position

T ------- S L where she became a semicircle or crescent when it is 90 degrees with respect to the line joining the sun to the earth continues to rotate until


L ------ T ------- S the full moon or full moon where we see his face fully illuminated.
In its clockwise rotation to acquire the following position:
T ------- S L
begins to appear as a letter D with decreasing phase that is illuminated in the last quarter showing as a semi-circle D-shape when positioned at 90 degrees but the opposite side of the waning crescent and continues to re-position the new moon invisible.
This tour lasts approximately 28 days so that in one year tends to make 13 trips moles. In the northern hemisphere as C is waning while the D is growing. This small satellite
physical laws exert attractive forces on earth like the sun, so that fluids (sea and air) will be brought to her causing the tides and variations in atmospheric pressure between 990 Hp ( hecto pascals) and 1040 Hp be the normal pressure of 1013 Hp. When the tide is low pressure and vice versa.
A Hp causes a change in barometric tide 1cm. Generating high tide or high tide or low tide.
In our country, the Naval Hydrographic Service belonging to the Ministry of Planning of the Ministry of Defence, published daily predictions with the times and heights of high and low waters of the ports of Argentina and the daily predictions of tidal currents. The calculations are performed by the Computer Center of the department of oceanography.
Wondering why? we go a little along the path of scientific knowledge.

Man is just a dot on the vast Universal but has an important purpose of being

Woman Tied To A Table

Why does the rainbow? CF Cf

SCIENCE EASY N º 175

Author: Maria Cristina Chaler.

Let's Play Series to why?

Why does the rainbow?

This beautiful rainbow that is inspiring stories, poems and legends have a physical reason to exist. Science in their ongoing quest that explanation explains and breaks no poetry but strengthens, then discover the wonders of nature increases our wonder and deepens our humility. Scientist discover what nature itself built long before the discovery

Referring to sunlight, we speak of white light, because it is composed of a cluster of different energies, some visible our eyes and others are not. In it, an area of \u200b\u200bseven continuous color that is called the visible spectrum.
These are the colors of the rainbow, inspiring colors for art and poetry.
Each has different energy, ie, vibrates differently and that their frequencies (f) (number of waves per second) and hence its wavelength (λ) (distance between peaks or valleys waves) change.
Recalling that a nanometer (nm) equals 1mm/1000000 (1milimetro divided into 1 million parts) or 1m/1000000000 (1 meter divided by 1000 million shares) the colors of our visible spectrum has the following wavelengths : Red

• (620nm_750 nm)

• Orange (590nm_620nm)

• Yellow (570nm 570nm_)

• Blue ( 450nm_495nm)

• Indigo (380nm_400nm)

• Violeta (400nm_450nm)

Recall that a longer wavelength less often and consequently lower energy.

The colors mentioned, crossing the transparent media with different speeds and out of them do it at different angles, separating from each other and forming the visible spectrum, commonly called rainbow when the phenomenon occurs in the atmosphere.
The rainbow is not always present, if we remember when the sun appears in the presence of water and do not see it anywhere, the sun must be behind or over our heads and water droplets dispersed in front with enough wealth, So enjoy his presence when it rains and sunny, facing the falls or in front of a lawn sprinkler. Water droplets suspended in air are the medium that makes the colors of white light scattering suffer needed and separated. The light incident on the drops, a part of it is reflected in a mirror and part of the cross or dispersing the colors are refracted and forming a beautiful rainbow. The arch shape is because our eyes only perceive the colors that come from the base of a circular cone at angles that are between 42 º (red) and 40 º (blue) whose vertex comes from our eyes, the greater is the rainbow more distant is the basis of this cone, and positioning in that we are different we see rainbows, ie each individual sees or not your own rainbow.
The colors have an order in the arc which is related to the frequency of each of them that makes the diversion more or less angle, red is the outside (42 degrees) and blue inside (40 °) and among the rest.
Each arc of the same, color will be formed by all the drops are in the correct position and proper distance to allow us to see.
If you were to occur within each droplet multiple internal reflections so that the light generated by other outlets, you might get to see another rainbow (rainbow secondary) whose colors would be inverted with respect to the first and would be a little weaker.

and uncover the mystery of the rainbow, now when we see observe the order of their colors and look for the secondary rainbow.

Man is just a dot on the vast Universal but has an important purpose of being