NW from 5 Am advisory
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tampastorm
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NW from 5 Am advisory
.3 north and .3 west for what its worth. Though important to remember the advisory still says WNW.
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dolebot_Broward_NW
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.3N and .3W do not make a 315 (Northwest) heading. Degrees of longitude are not equidistant at every latitude. This is the basic lesson in navigation every ship captain learns. As you head north the distance between 2 degrees of longitude decreases. This is because the earth is a sphere.
Distance between 2 degrees of latitude are equidistant.
Distance between 2 degrees of latitude are equidistant.
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tampastorm
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storms in NC
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Re: NW from 5 Am advisory
tampastorm wrote:.3 north and .3 west for what its worth. Though important to remember the advisory still says WNW.
They go on a 12 hour avg
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tampastorm
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storms in NC
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tampastorm wrote:Yes 12 hrs, thats why I made a point of saying since 5 AM.
I just got up and I had no Idea it would have got this big. sure glad I was able to talk my family to leave yesterday evening.they were going to stay. they are in their 70's. I wasn't worried about the water but they have the bigest oak trees all around the house.
Last edited by storms in NC on Sun Aug 28, 2005 7:21 am, edited 1 time in total.
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tampastorm
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dolebot_Broward_NW
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I disagree .3-.3 is NW.
LOL, methinks ya'd make a bad pirate, YAAARRRRGH.....
Ex-Navy here too. Got quite a bit going against ya here tampastorm.
Heres the math involved:
Each degree of latitude is approximately 69 miles (111 kilometers) apart. The range varies (due to the earth's slightly ellipsoid shape) from 68.703 miles (110.567 km) at the equator to 69.407 (111.699 km) at the poles. This is convenient because each minute (1/60th of a degree) is approximately one mile.
So since we're at about 25 degrees N latitude lets call it 68.9.
0.3degrees x 68.9 = 20.67 miles north travel.
Here is where everybody gets confused on the longitude:
A degree of longitude is widest at the equator at 69.172 miles (111.321) and gradually shrinks to zero at the poles. At 40° north or south the distance between a degree of longitude is 53 miles (85 km).
@ 45 degrees its 49 miles
@ 40 degrees its 53 miles
@ 25 degrees its 62.7 miles
A reasonably good approximation of the distance between two lines of longitude at any point can be had in meters by multiplying the 111,324 by the cosine of the latitude at the point in question. Use the number 365,235 if you prefer to work in feet.
0.3 degrees x 62.7 = 18.81 miles of westward travel.
tan (theta)=20.67/18.81
tan (theta)=1.0988835725677830940988835725678
(theta)= 52.1335 degrees. Add 270 degrees
Heading is 322.1335. Thats NW for sure, actually its past NW towards NNW, but its still very far from 315 (exactly NW).
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