Sunday, March 4, 2012
Rainbow
Rainbow
Rainbow occurs when water meets sunlight. It usually occurs during or after a rain, forming a bow of colours. It is a natural phenomenon.
A rainbow has the colours of red, orange, yellow, green, blue, indigo, and violet.
Why don’t we see rainbow that frequently?
Actually, when there are water droplets in the air, a rainbow could be seen as the sunlight passed through them. Rainbows would usually appear in the afternoon especially after the rain. As the rain washed away the dust from the air, the percentage of water in the air rises. So when the sunlight shined upon these water droplets, light will be reflected and refracted, causing a rainbow to appear. Other than that, we could also find rainbows around waterfalls. Have you tried ‘making’ rainbows? That’s right! Rainbow could appear if we spray water into thin air during a sunny day!
A rainbow does not actually exist at a particular location in the sky. Its apparent position depends on the observer's location and the position of the Sun. All raindrops refract and reflect the sunlight in the same way, but only the light from some raindrops reaches the observer's eye. This light is what constitutes the rainbow for that observer. The position of a rainbow in the sky is always in the opposite direction of the Sun with respect to the observer, and the interior is always slightly brighter than the exterior. The bow is centred on the shadow of the observer's head, or more exactly at the antisolar point (which is below the horizon during the daytime), appearing at an angle of 40–42° to the line between the observer's head and its shadow. As a result, if the Sun is higher than 42°, then the rainbow is below the horizon and usually cannot be seen as there are not usually sufficient raindrops between the horizon (that is: eye height) and the ground, to contribute. Exceptions occur when the observer is high above the ground, for example in an aeroplane, on top of a mountain, or above a waterfall.
Multiple rainbows
Although most people will not notice it because they are not actively looking for it, a dim secondary rainbow is often present outside the primary bow. Secondary rainbows are caused by a double reflection of sunlight inside the raindrops, and appear at an angle of 50–53°. As a result of the second reflection, the colours of a secondary rainbow are inverted compared to the primary bow, with blue on the outside and red on the inside. The secondary rainbow is fainter than the primary because more light escapes from two reflections compared to one and because the rainbow itself is spread over a greater area of the sky.
Postscript:
I believe all of you love rainbows don’t you? A rainbow could always give us a sense of hope as it always appears after a rain. It brings such vigorous spirit within its seven joyful colours. However, it wouldn’t have been called a rainbow if one of the colours’ is missing. A rainbow may not appear on a daily basis as it requires the cooperation of water and sunlight.
Cheerful as it is, a rainbow could only stay for about 10 to 20 minutes. To cherish the rainbow within a limited time, most of us would have dropped the things on our hand and stare hopefully at it. What a magical charm it possesses.
Our mentor, Ikeda Sensei had been frequently welcomed by rainbows on his visitations. Perhaps it is Ikeda Sensei’s nobleness that has called upon the rainbow! Sensei’s always been praising the rainbow, saying that we should be just the same, to be as cheerful and hopeful as the colourful rainbows.
Actually, Rainbows are everywhere. Even glass could sometimes reflect sunlight and produces rainbow. If we could just look closer, we might be surprised. As we accomplish every single mission of ours, we collect the water droplets. In other words, the ‘rainbow’ that represents our victory is actually made up of all those little achievements. As we strive to the hardest on the journey of kosen-rufu, we will sure to be achieving a kind of happiness that glows as colourful as the rainbow!
When we look forward to protecting the ‘rainbows’ in our children’s hearts, we’ll be able to bring hope to the people around us. As a result, a message of peace could be easily spread throughout all the places!
Shared by,
Colours.
Rainbow occurs when water meets sunlight. It usually occurs during or after a rain, forming a bow of colours. It is a natural phenomenon.
A rainbow has the colours of red, orange, yellow, green, blue, indigo, and violet.
Why don’t we see rainbow that frequently?
Actually, when there are water droplets in the air, a rainbow could be seen as the sunlight passed through them. Rainbows would usually appear in the afternoon especially after the rain. As the rain washed away the dust from the air, the percentage of water in the air rises. So when the sunlight shined upon these water droplets, light will be reflected and refracted, causing a rainbow to appear. Other than that, we could also find rainbows around waterfalls. Have you tried ‘making’ rainbows? That’s right! Rainbow could appear if we spray water into thin air during a sunny day!
The size of water droplets in the air would determine the brightness of a rainbow’s colours. When the size of water droplets increases, the rainbow’s colours would appear brighter and narrower. It goes vice versa as the size of water droplets vary. It isn’t possible to see a rainbow while we’re facing towards the Sun. We could only see them when our back is facing the Sun. This explains why rainbow appears on the West in the morning, and on the East at noon. Do you know that we might even be able to predict the weather by looking at a rainbow? When a rainbow appears on the East, the possibility of raining would be low. But when a rainbow appears on the West, it probably means that rain is coming towards your way!
A rainbow does not actually exist at a particular location in the sky. Its apparent position depends on the observer's location and the position of the Sun. All raindrops refract and reflect the sunlight in the same way, but only the light from some raindrops reaches the observer's eye. This light is what constitutes the rainbow for that observer. The position of a rainbow in the sky is always in the opposite direction of the Sun with respect to the observer, and the interior is always slightly brighter than the exterior. The bow is centred on the shadow of the observer's head, or more exactly at the antisolar point (which is below the horizon during the daytime), appearing at an angle of 40–42° to the line between the observer's head and its shadow. As a result, if the Sun is higher than 42°, then the rainbow is below the horizon and usually cannot be seen as there are not usually sufficient raindrops between the horizon (that is: eye height) and the ground, to contribute. Exceptions occur when the observer is high above the ground, for example in an aeroplane, on top of a mountain, or above a waterfall.
Multiple rainbows
Although most people will not notice it because they are not actively looking for it, a dim secondary rainbow is often present outside the primary bow. Secondary rainbows are caused by a double reflection of sunlight inside the raindrops, and appear at an angle of 50–53°. As a result of the second reflection, the colours of a secondary rainbow are inverted compared to the primary bow, with blue on the outside and red on the inside. The secondary rainbow is fainter than the primary because more light escapes from two reflections compared to one and because the rainbow itself is spread over a greater area of the sky.
Postscript:
I believe all of you love rainbows don’t you? A rainbow could always give us a sense of hope as it always appears after a rain. It brings such vigorous spirit within its seven joyful colours. However, it wouldn’t have been called a rainbow if one of the colours’ is missing. A rainbow may not appear on a daily basis as it requires the cooperation of water and sunlight.
Cheerful as it is, a rainbow could only stay for about 10 to 20 minutes. To cherish the rainbow within a limited time, most of us would have dropped the things on our hand and stare hopefully at it. What a magical charm it possesses.
Our mentor, Ikeda Sensei had been frequently welcomed by rainbows on his visitations. Perhaps it is Ikeda Sensei’s nobleness that has called upon the rainbow! Sensei’s always been praising the rainbow, saying that we should be just the same, to be as cheerful and hopeful as the colourful rainbows.
Actually, Rainbows are everywhere. Even glass could sometimes reflect sunlight and produces rainbow. If we could just look closer, we might be surprised. As we accomplish every single mission of ours, we collect the water droplets. In other words, the ‘rainbow’ that represents our victory is actually made up of all those little achievements. As we strive to the hardest on the journey of kosen-rufu, we will sure to be achieving a kind of happiness that glows as colourful as the rainbow!
When we look forward to protecting the ‘rainbows’ in our children’s hearts, we’ll be able to bring hope to the people around us. As a result, a message of peace could be easily spread throughout all the places!
Shared by,
Colours.
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