Question

How is compass used for finding direction at unknown place ?

Answer 1

Answer:

compass has a magnetic needle that can rotate freely. When a compass is kept at a place, the magnetic needle aligns in a north-south direction. ... The red arrow of the compass is termed as the North Pole and the other end is called as is termed as the South Pole and this helps Compass to fire us to find the directions.

Explanation:

hope it helps you thank you

Answer 2

Answer:

The earth has a magnetic field. The compass needle is a magnet.

So the field around the needle lines up with the field around the

earth, and by the polarization of the magnetic needle, you can tell

the direction of magnetic north (which is hundreds of miles from

true north). True north and south are the axis of the earth. The

magnetic field around earth is what determines what is the north

end of the axis and the south end: the magnetic flux comes out of

one end and into the other. So the end it comes out of is called

north, and the end it gos into is called south. Now, there is a

star called the north star, because it is directly above the north

pole and in line with the axis: so at night you can site the north

mark, or N, on your compass at the north star, and count the

degrees or marks on the compass, that are between the north mark;

and the way the needle is pointing. This is the number of degrees

that magnetic north varies from true north at your present time and

location. In the day you can line up the north mark to the needle,

then move the north mark the amount of degrees of variance, in the

direction of true north, remembering the side the needle was on

when you took the measurement, so that the north mark points at

true north. The reason true north is important is because all maps

are made by true north. And of course, once you get your compass

pointed at true north, all the other directions are marked.

So to get your north/south position on the globe. If you stand

underneath the north star, then you are standing on the north pole,

this is a 90o angle. A tool called a sextant is used for this, but

I'll tell you what has to be done. You measure the degree of angle,

between the horizon and the north star: this is your position in

degrees. Degrees are subdivided into minutes and seconds for more

accuracy. If you are wondering how this works, maps are measured in

degrees. So the exact degrees minutes seconds you find between the

north star and the horizon, you just find the same degrees on the

map and that is your north/south position. You can only use the

north star in the northern hemisphere though, if you are in the

Southern Hemisphere, you have to use a cluster of of southern pole

stars, but they are not so close in line with the axis and above

the south pole as to take a direct reading, that is if you want to

be at least sort of accurate. Also north/south lines are called

latitude lines.

Now to measure your east/west position. You need a very good

time keeping clock. So where as you know the position of the north

star over the earth because it doesn't change, at least not by

much; the stars over the equator change position over the earth,

because the earth turns. But if you know the orbits, you can tell

at what time they will be in what position over the earth. There

are books with nothing but positions of stars, and the times of

those positions. So after you get a stars future position, you wait

for the exact time, then measure the angle of that star to the

horizon, do the calculations based on position from star book, and

you will have your east/west position. Then you just draw the lines

on the map, and where they cross is where you are. Also, east/west

lines are called longitude lines. I will say though, that if a land

mark, as they're called, where around, you can mark your position

off of them; because they are marked globally already.

To be more specific to the question, there is no uncharted

place. But say you didn't have a map; you can of course mark and

record your own positions with said methods, and find your way back

and forth between them, but to get more positions you would have to

just set out on an adventure, and mark as you went. But you would

only have what you marked. If you wanted to find a town that you

have not marked, a compass its self can not get you there.

If you want to learn navigation, you should look up, wilderness

navigation and map & compass, should give every thing you

need.

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