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Fly Me to Polaris Print E-mail
Written by Raweepong   
Monday, 17 August 2009 12:02

Looking up to the sky on the dark moonless night is such happiness for a star observer like me. It brings me imagination as well as pleasure to observe around while finding certain stars’ location, watching them move from east to west. Up there, I see a lion, bears, and a crocodile. And what about you? What do you see up there?


Different seasons present different stars. For Thailand the perfect time to observe them is Winter as the sky will be so clear with less vapour in the air. Stars commonly seen during Winter are Orion, Canis Minor, Cassiopia, Ursa Major, Taurus and Pleiades. But there’s the only one special star that will come to your presence all year round – Polaris or the present North Star.

Did you know that for thousands of years these stars had been mapped and in prehistoric time they were not arranged the way we knew today? Let me take the North Star as an example. It is extremely essential to people who travel at night as it helps guiding their direction. Today, the north pole of our planet points to Polaris which is in the constellation of Ursa Minor. Well, 5,000 years ago in the time of ancient Egypt the North Pole pointed to Thuban in the constellation of Draco. The Egyptian used it as their north star for building a pyramid. In the next 13,000 years, the North Pole will again move to point at Vega in the constellation of Lyra. Next 25,800 years it will turn back to Polaris and this shall affect the stars map in equator system to differ according to the position of the North Star.  

Changes in stars’ positions do not depend only on the seasons but also depend on the star observer’s own location when looking at them. If we are at the North Pole, the Polaris then will be right above our head and we will only see stars of the northern hemisphere. On the contrary, if we go to the South Pole, it will be the opposite. We won’t see the North Star as it is below our feet. There’re only stars of southern hemisphere to be seen. So, don’t buy it when a guy asks you to see the North Star in Australia or New Zealand, no matter how romantic it sounds.

Thailand is 15 degree above the equator (around 18 degree for Chiang Mai) in which we can see stars from both hemispheres though it’s rather partial to the north. We see the North Star at 15 degree above skyline in the north. Well, the North Star itself has only 1.80 magnitude of brightness which is not sufficient to notice somehow. Thus, we can look for some stars of the north hemisphere to guide the position of the North Star, which are in two constellations as follow.

1. Cassiopia or so-called Bat Stars for Thai perception. It is a noticeable constellation comprised of five stars forming letter M looking like a flying bat. Cassiopia is about 25 degree from the North Pole. Its middle star points to the Polaris. This group of constellation is opposite to the Ursa Major so it can be used as a guideline, as well as the Ursa Major.

 



2. Ursa Major, or Crocodile Stars for Thai, is usually used as a guideline for it is rather high in distance from the skyline and is easy to spot. Row of two first stars points to the North Star, which is at 25 degree below or 5 times of the interval between the first two stars. Ursa Major is a very common constellation for many new star observers as it is obviously visible. The names are changed according to the imagination of each culture. Thai calls it Crocodile. Laos calls Elephant’s Head while people in the UK call it Plough. Chinese and North American see it as a Big Dipper. I had seen it a few times in Maejam district, Chiang Mai and a Pakeryaw hill tribe there call it ‘sha ka sher’ which means an elephant’s head, just like the Laos. Well, I would say I agree with them as it looks more like an elephant’s head than a crocodile. And when it moves around the North Pole, that elephant can also raise its trunk.

In academic terms, a star is merely a lump of mass and energy. However I still find pleasure and imagination every time I see them. Whenever I see a shooting star, I would pray for good things even though I know it is actually just an object falling from the sky into the atmosphere being burnt by friction. For me, meteor or shooting star is always a miracle. And I would not support anyone to let academic knowledge ruin our imagination, for they should be spent together harmoniously in the right place and at the right time. As a matter of fact, imagination does matter, not even less than knowledge at all.

 
hodesigner
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