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How to find yourself ?

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How to find yourself ?

Old 17th May 2014, 11:56
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How to find yourself ?

Being old and still Bold, I agreed to go to Beirut...Sorry Cyprus for a short hols with my wife, sat in the Thomson A/C and flew in a south easterly direction good but boring flight and kept checking the heading on my I phone thingy.

When in the good part of Cyprus (Paphos) I notice the I phone thingy was showing a Long/lat of

34 Deg 50' 40" N with the lat being 32 Deg [email protected] 2" E.

It may sound odd to you people out in Rotor-head world but how is this position. reading deciphered, I understand the Lat and Long Degrees, but what are the other parts are they Mins and seconds and if so how are they used to locate the actual point where I took the reading.

Peter R-B
Lancashire
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Old 17th May 2014, 12:03
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It's the sexagesimal subdivisions - 1 is divided into 60 minutes, each minute into 60 seconds.
Thus each degree can be divided by 3600 - just gives more accuracy...

On the surface of the planet, a degree is around 70 miles, a minute is just over a mile and a second around 100 feet.
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Old 17th May 2014, 12:11
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You got it in one. Degrees, minutes, seconds.
how are they used to locate the actual point where I took the reading.
60 seconds = 1 minute, 60 minutes = 1 degree.

You were here

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Old 17th May 2014, 13:19
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I think we are exceedingly lucky that was decided well before Napoleon, but then again he did have to deal with the French who apparently only understand the rule of "one" fairly easily.

BTW a Marlborough packet was 30 miles across and 60 miles longways which in an old '47 that would 'bounce' almost as much as it would 'leap forward' each RPM was the same consonant in minutes. It was a good place to catch on the moby dicks.

cheers tet.
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Old 17th May 2014, 14:50
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Well I came to the Font,... and Knowledge plus crystal clear explanations gushed forth, thank you chaps I now understand more than just punching things into a Garmin or Sat nav.

And Brian yes bang on, that's why I suggested Beirut , however the Cypriot people are Gems and will always help when asked. Best thing was I found a nice little shop that sold Cordons Gin and Bombay at prices you would not believe, anyone going to the fair isle go to Paphos town and look up Theos Cava, he sells such delights for 11 Euro's I litre bottles with bubble at around 5/6 euros. had a good but hazy time.

Peter R-B
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Old 17th May 2014, 15:02
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It's worth bearing in mind that some Nav systems use degrees, minutes and decimals of minutes (rather than seconds).

Thus 51 28 06 North would become 51 28.10 North.

It's a big enough difference to have you looking for your HLS in the wrong place if you don't spot it.

OH
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Old 18th May 2014, 12:46
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Hey 500,

I will be back in October, so I will give you a shout nearer to that time. No doubt you are aware of Theo's Cava and the splendid prices. The guy himself has a super attitude and humour.

Peter R-B
Lancashire
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Old 18th May 2014, 15:20
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On the surface of the planet, a degree is around 70 miles, a minute is just over a mile and a second around 100 feet.
Just to be that person and expand on Nige321's comment, a degree of Longitude - moving North or South between 2 points on the globe - is always 60 Nautical miles (about 70 regular miles), but a degree of Latitude - moving East or West between 2 points on the globe - is only 60 miles at the equator.

If you can imagine the vertical lines of Longitude pinching in towards the poles, the distance between them obviously gets less as you move away from the equator. If you remember any trigonometry from school, you might recall the Cosine function. This is equal to 1 at zero degrees and 0 at plus or minus 90 degrees. Now transplant this to the globe, at the equator, which is zero degrees latitude, you multiply the 60 nautical miles by the Cosine of 0 degrees =1 = 60 nautical miles. At the North or South pole if you multiply the 60 nautical miles by the Cosine of 90 degrees =0 = 0 nautical miles. This just proves that as all lines of longitude meet at the Poles there is no measurable distance between them.

In the example given for Cyprus, at 34 Deg 50' 40" N longitude the Cosine value is roughly 0.8220 (Swagged, not calculated). A degree of latitude (assume due East or West) at that longitude is approximately 49.32 Nautical Miles rather than 60 Nautical miles.

Conclusive evidence indeed that Sunday mornings can be quite boring for me.

Last edited by Two's in; 18th May 2014 at 17:36.
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Old 18th May 2014, 18:03
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Just to be that person and expand on Nige321's comment, a degree of Longitude - moving North or South between 2 points on the globe - is always 60 Nautical miles (about 70 regular miles), but a degree of Latitude - moving East or West between 2 points on the globe - is only 60 miles at the equator.
I think you got your lats and longs mixed up.
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Old 19th May 2014, 00:46
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You can calculate the length of a degree latitude/longitude here

http://msi.nga.mil/MSISiteContent/St...rs/degree.html

Length of a degree of latitude - nautical miles

0 zzzzzzzz59.7052508693788
10 zzzzzzz59.7233545410539
20 zzzzzzz59.775526031
30 zzzzzzz59.855511344
40 zzzzzzz59.953929486
50 zzzzzzz60.05893078237827
60 zzzzzzz60.15784266125807
70zzzzzzz 60.238650868
80 zzzzzzz60.291480673
90 zzzzzzz60.309913503

Difference of 3,674 feet between 0 and 90

Length of a degree of longitude at the equator is 60.10764611706782 nautical miles.

Got to get a life
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