Tag: sun

Posted in Life & Happiness

Sunset

Posted on by Jinavie

Why is the sky blue in the day, yet it becomes dyed bright red at sunset? The reason is that the atmosphere splits white light into the colours of the rainbow like a prism. Short-wavelength colours such as blue and green tend to scatter more, making the sky blue usually. But as the sun sets, the angle at which sunlight enters the atmosphere changes and the light has to travel through more atmosphere before hitting Earth. The more the light travels, the more it scatters and blue-green light is scattered so much that it can no longer be seen. At this stage, the dominant remaining colour are orange and red, which have longer wavelengths.

But this alone would only give the sky a dull red colour. The brilliant splash of red and orange across the sky every evening is thanks to the scattering of light in a certain way by cloud droplets and other particles. This is why an exceptionally bright orange sunset can suggest rain the following day.

A “perfect” sunset requires the alignment of various factors such as the angle of the sun (affected by time and season), humidity, temperature, air component and the surrounding landscape. Depending on these factors, the sunset can range in colour from a deep red to a bright orange, to a pastel yellow to baby pink or purple (or at worst, a piddly dull yellow light). This means that a perfect sunset tends to only happen at a single moment in time when these factors align to your preference.

The corollary to this is that a perfect sunset is always a fleeting moment. No matter how much you want to hold on to it, time marches on and the sunset slowly fades away. It is futile to stop the moment from passing – to cling to the beauty of the moment. All you can do is enjoy that single moment while you can. It is a time when the past day comes to a close, while the future is getting ready to start. In that moment, do not think about the past or the future – just focus on the present. Take in the brilliant colours with your eyes. Listen to the chirping of the birds returning home. Feel the cool breeze brush past you. When the sun finally sets, despair not the passing of the beautiful moment, but cherish the fact that you had such a great moment. Because as you know, another sunset awaits you tomorrow.

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Posted in Science & Nature

Honeybee Dance

Posted on by Jinavie

How do honeybees share the location of a food source, such as a flower, to other bees of their colony? An Austrian biologist named Karl Von Frisch devised an experiment to learn how the honeybees communicated with each other. He set up two different food sources and tagged every bee that came to pot A green and bees that came to pot B red. He then studied the behaviour of these bees back at the hive. What he discovered was fascinating.

For millennia, beekeepers have noticed that some honeybees have a tendency of moving in a peculiar yet methodical way once they returned to their hive after foraging for flowers. The bees would move in a straight line while waggling their bottom (moving side-to-side), then walk in a semicircle back to where they started. They would then waggle in the same direction, then move in a semicircle on the opposite side, completing a figure-eight path. This is called a waggle dance.

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Frisch noticed that bees with green spots and the bees with red spots both did the waggle dance once they returned to the hive, but in different directions. All bees with green spots danced so that the straight line pointed a certain direction, while the bees with red spots danced the same dance except pointing another direction. Amazingly, the angle between these two directions was exactly the same as the angle separating pot A and B (with the hive as a point of origin). Frisch deduced that the waggle dance was the language of honeybees.

Through further experimentation, Frisch was able to tease out the details of this “language”.

  • Honeybees’ eyes can see ultraviolet and polarised light, which allows them to see where the sun is in the sky at all times. This is because sunlight polarises so that it points towards the sun and honeybees can see this direction. Therefore, the bee’s eyes act as a solar compass that tracks the exact location of the sun in real-time.
  • Bees have a finely-tuned internal clock that allows them to predict exactly where the sun should be depending on time, season and latitude, as the sun moves through the sky.
  • Another point of reference that is used in the bees’ language is gravity. Gravity is a constant that does not change, meaning all bees know which direction is “up” and which is “down”. This also means they can use a vertical, perpendicular line as a standard zero-point.

By pairing the two global constants, gravity and the location of the sun, the bees can accurately signal to other bees the direction they should fly in to find the food source. If a bee does a waggle dance that points 60° right from the vertical “up” direction (as defined by gravity), it signals that the bees should fly 60° right from the direction of the sun. If the angle is 0°, the bees should fly directly towards the sun, and if the angle is 180°, the bees should fly directly away from the sun. The bees use their internal clock to calibrate the direction depending on the time of the day.

The straight line “waggle” part of the dance gives the information of distance. The longer the duration of the straight line, the further away the flower is. As a general rule of thumb, the duration of the straight line increases by 1 second for every 1 kilometre. When the food is within about 60m of the hive, the 8-shape waggle dance turns into an O-shape round dance. The bee deduces the distance by the energy required to fly to the location.

By encoding the two variables “direction” and “distance”, a bee can effectively use the waggle dance to accurately pinpoint the location of a food source. It is amazing to see that animals that we consider “primitive” such as bees have such an intricate method of communication.

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(Image source: http://aireona93.deviantart.com/art/YAY-Waggle-Dance-146361214?q=boost%3Apopular%20waggle%20dance&qo=1)

Posted in History & Literature

Week

Posted on by Jinavie

In Genesis from the Old Testament of the Bible, it is said that God created the world in six days and rested on the seventh. But the system of a seven-day week can be found in many other cultures and religions. The origin of the seven-day week system is ancient Babylonia. The Babylonians believed that every seventh day was one of misfortune, with 7 having the significance that it is the largest single-digit prime number and the number of heavenly bodies known at the time (sun, moon, five planets). This was passed on to the Jewish people who made the seventh day the Sabbath. This was then adopted by Catholics in Rome and in 325AD, it was officially decided at the Concilium Nicaenum (official council that was held to vote for the official religion of Rome) that every week would be seven days long.

There is also a reason for assigning a heavenly body to each day (Monday = Moon, Tuesday = Mars, Wednesday = Mercury, Thursday = Jupiter, Friday = Venus, Saturday = Saturn, Sunday = Sun). At first, the order of the days was the same as the order of heavenly bodies by their distance from the Earth: “Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon”. This was then cross-referenced with the astrological 24-hour system of planetary hours, resulting in a new order of “Saturn, Sun, Moon, Mars, Mercury, Jupiter, Venus”. Because of this, the week started on Saturday in ancient times. It was only during Roman times when the week was changed to start on the Sunday, with Sunday becoming an official day of rest.

The Romans named the days after the heavenly body assigned to that day. For example, “Sunday” obviously comes from “Sun”, with the same applying to Monday and Saturday. This system is used in Korea and China, where each day is labelled according to the assigned planet. For example, Thursday is 목요일(mok yo il) in Korean, where 목 means wood, with 목성(mok sung) meaning Jupiter.

In English, the names of each day are mixed. Some are based on planets like the Korean system (Saturday, Sunday, Monday), while others inherit their name from the Germanic people. The Germanic people assigned one of their gods (from Norse mythology) to each day (except Sunday and Monday, which are related to the Sun and the Moon, while Saturday had a completely different name). Tuesday stands for “Tyr’s day”, Wednesday stands for “Wodan’s(or Odin’s) day”, Thursday stands for “Thor’s day” and Friday stands for “Frigg’s day”.

Interestingly, the Norse god assigned to each day correlates with the Greek/Roman god assigned to it. For example, Thursday is “Thor’s day” and also “the day of Jupiter”. Jupiter is the Roman king of gods (same as Zeus from Greek mythology) who uses lightning, while Thor is the Norse god of thunder.

Not every country calls each day a meaningful name. In China, Monday is simply 星期一(xing qi yi), or “first star period”, with each day after that being one number higher (Sunday is specially called 星期日(xing qi ri), where the number is replaced by the character for “Sun”). Although China used the same system as Korea and Japan based on 음양오행설(eum yang oh hang sul, system of Five Elements and Yin Yang), the days were renamed with the simplification of the language.

Posted in History & Literature

Elements: Yin And Yang

Posted on by Jinavie

Yin-yang is a frame of thinking that can be considered a fundamental basis of Eastern philosophy. In ancient Far East Asia, people categorised everything of nature as yin or yang, including natural phenomenon such as human physiology. Yang(陽) is a masculine element, yin(陰) is a feminine element and the two represent the countless symmetries found in nature. Just as there is a sky for the earth, a sun for the moon, a man for a woman and strength for softness, every phenomena in human societies and the universe can be identified in relative terms. The concept of reducing these to a plus and a minus to explain natural events is the concept of yin and yang.

For example, consider a hill in the sunlight. The bright side is called the “yang place” and the opposite, dark side is called the “yin place”. Thus, light is yang, darkness is yin. That is not all. The air that is heated by sunlight becomes warm and rises, while cold air sinks because it is heavy. Yang symbolises heat, lightness and upward, active movement while yin symbolises cold, heaviness and downward, sluggish movement. But that does not mean that yin is bad and yang is good. The reason being, everything that counters each other in nature coexists and forms a balance. Also, as time passes, the sun will move from the east to the west, making the sunny place dark and the dark place sunny. Yin-yang is a law that shows the relativity of nature very well. It shows that everything is relative to each other even if they seem like opposites, forming a harmonious balance and cycle.

Balance forms harmony and nature always seeks harmony. For example, traditional Korean and Chinese medicine is based on the concept that the reason why diseases occur is because of the balance of yin and yang in the human body being broken. To restore the balance, acupuncture and herbal remedies are used, restoring good health. A broken harmony is due to one side being greater than the other as yin and yang form a zero-sum game. This means that as one side waxes, the other side wanes and vice versa, with the sum of the two being equal at all times. But this does not mean that yin and yang oppress and fight each other. Instead, the two rely on each other despite being opposites. In this world, there is no light without darkness. There is no forwards without backwards and no life without death. For instance, if there were only men (yang) in this world, the human race would be wiped out in one generation. But if yin and yang coexist to help each other and form a union, they give birth to a new generation. Nature always exists as a perfectly balanced coexistence of two polarities. When yin and yang form a balance they form something even greater than their sum, which is harmony.

1 + 1 = 3

(Image source: http://falynevarger.deviantart.com/art/Yin-Yang-Dragons-119779525)

Posted in History & Literature

Direction

Posted on by Jinavie

Most of mankind’s major expeditions happened from east to west. Since the beginning of man’s history, people have wondered where the giant fireball set at the end of the day and followed the journey of the sun. Odysseus, Christopher Columbus and Attila the Hun all believed the answer lied in the west. To journey to the west – that was a quest to know the future.

Contrary to the people who questioned where the sun was heading towards, there were also people who wondered where the sun came from. Marco Polo, Napoleon and Bilbo Baggins (protagonist of The Hobbit By J.R.R. Tolkien) are examples of people who travelled to the east. They believed that they would surely discover great things in the place where everything originated from.

In the symbolic system of adventure, there are still two directions left for travellers. The meanings of each are as follows: to venture north is to seek obstacles that can test your abilities, while journeying to the south is seeking rest and peace.

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(from The Encyclopaedia of Relative and Absolute Knowledge by Bernard Werber)