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#121
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Navigation Question
JAXAshby wrote: KP did require (as of at least 10 years ago) and may still require coursework to graduate that includes Lunar Distances. I find that hard to believe in any context other than as a historical side note. It is not required for a license. Please feel free to show the course which includes full instruction on Lunar Distance and requirements for a candidate for 3rd Mate to know this. I didn't learn of chronometers or Lunar Distances by googling. I knew of each before google came into existence. Ok, so before "Google" you used "Funknwaggle". Chronometers were damned expensive until mid 19th century and still had temperature compensation problems until well into the 20th century. These problems were eventually solved with the introduction of consumer electric watches. Lunars were still commonly used on commercial vessels (as opposed to military vessels) until about 150 years ago. The need for celestial nav at all started to go away by the early 1920's when radio navigation started to come online with commercial radio stations, which were required to give their call letters, the city of transmission and frequency every ten minutes. BG Where do you find this stuff? Mechanical chronometers will always have some degree of "compensation" problems, but it wasn't a "problem", once the "time tick" became readily available. In some areas, I don't doubt you can find individuals using "Lunars", into the last century as part of their celestial navigation. Celestial did not start to disappear in use until the advent of Sat Nav, which was in the 80's, not 20's. The use of RDF, Loran, Decca, etc., preceded this, but because of limited range, accuracy,reliability, etc., it did not really affect the GLOBAL use of celestial which predominated until the late eighties, early nineties. otn |
#122
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Navigation Question
On Tue, 24 Feb 2004 12:27:54 +1100, OzOne wrote:
On 24 Feb 2004 01:16:39 GMT, (JAXAshby) scribbled thusly: I was a professional motor mechanic starting the summer before 7th grade (my father owned the place). Yeah, OK Jocks...and what was the degree which allowed you to become a motor mechanic? Oz1...of the 3 twins. So what was the degree Jocks? You should be asking him if Sally Struther's name appears on his "diploma" Have you ever noticed how jax always argues in the general but avoids the specific like the plague? Oz1...of the 3 twins. I welcome you to crackerbox palace,We've been expecting you. |
#123
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Navigation Question
I used to think that using lunars was common until radio time signals finally
eliminated issues about chronometer expense and accuracy around 1912. Then I came across a tutorial written about 1890 which complained that although the technique of lunar distances was still taught, they were considered too tedious by most seamen and had pretty much fallen into disuse. Jax is probably correct that it was little used around 1800. Even after Bowditch was published in 1802 there were very few seamen who could handle the math. I believe there is a minor resurgence now that most computer programs will handle the nasty math. "otnmbrd" wrote in message ink.net... JAXAshby wrote: otn, you just explained why celestial navigation is worthless. you also explained why celestial navigation as the term is used does not include Lunar Distances. btw, Lunar Distances were in common use on most ships until about the middle of the 19th century, not the beginning. Oops .... got my centuries wrong.(meant to say not living prior to the 20th century) Actually, Lunar distances were used to some degree, through the 19th century, but the need for them became academic, once the chronometer was readily available. As for celestial being worthless, I will admit, to someone such as yourself, who has never learned to use it and/or become proficient in it's use, it is useless, coupled with the fact, that as "galley boy", you'd never have the need. It is, however, included in "celestial navigation", since, once again, it involves sights of celestial bodies (or are you also unaware of the methods used to obtain the basic information used in lunar distances?). Go back to googling, Jax .... as always,the response to your responses quickly become exercises in talking to a brain dead Cocker Spaniel (My apologies to the Cocker Spaniel owners out there). otn |
#125
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Navigation Question
Doug,
The Navigator on the "Bounty" used moon time. That was a few years before Harrison's Time piece. It would be very, very interesting to hear the Jax's explanation of taking the moon's sighting and the calculations into Longitude, don't you think? Ole Thom |
#126
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Navigation Question
A few small points after some research - In the 1886 edition of Bowditch it
recommends using Lunar Distances on occasion to check the accuracy of the chronometer, but not as the primary method of determining Longitude. The original 1802 edition considers it superior method for determining longitude. One problem, however, is that it requires 3 simultaneous sights (distance between, and the altitudes of two bodies), which implies 4 people working together. It is possible for one person to do it, but the mathematics becomes much more tedious. "Jeff Morris" wrote in message ... I used to think that using lunars was common until radio time signals finally eliminated issues about chronometer expense and accuracy around 1912. Then I came across a tutorial written about 1890 which complained that although the technique of lunar distances was still taught, they were considered too tedious by most seamen and had pretty much fallen into disuse. Jax is probably correct that it was little used around 1800. Even after Bowditch was published in 1802 there were very few seamen who could handle the math. I believe there is a minor resurgence now that most computer programs will handle the nasty math. "otnmbrd" wrote in message ink.net... JAXAshby wrote: otn, you just explained why celestial navigation is worthless. you also explained why celestial navigation as the term is used does not include Lunar Distances. btw, Lunar Distances were in common use on most ships until about the middle of the 19th century, not the beginning. Oops .... got my centuries wrong.(meant to say not living prior to the 20th century) Actually, Lunar distances were used to some degree, through the 19th century, but the need for them became academic, once the chronometer was readily available. As for celestial being worthless, I will admit, to someone such as yourself, who has never learned to use it and/or become proficient in it's use, it is useless, coupled with the fact, that as "galley boy", you'd never have the need. It is, however, included in "celestial navigation", since, once again, it involves sights of celestial bodies (or are you also unaware of the methods used to obtain the basic information used in lunar distances?). Go back to googling, Jax .... as always,the response to your responses quickly become exercises in talking to a brain dead Cocker Spaniel (My apologies to the Cocker Spaniel owners out there). otn |
#127
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Navigation Question
Jeff Morris wrote: I used to think that using lunars was common until radio time signals finally eliminated issues about chronometer expense and accuracy around 1912. Then I came across a tutorial written about 1890 which complained that although the technique of lunar distances was still taught, they were considered too tedious by most seamen and had pretty much fallen into disuse. Jax is probably correct that it was little used around 1800. Even after Bowditch was published in 1802 there were very few seamen who could handle the math. I believe there is a minor resurgence now that most computer programs will handle the nasty math. G Think you just pulled an "otn". I think it was extensively used around 1800, but had fallen to a point of much less use by 1900. The advent of the radio as standard equipment on ships and the use of the "time tick", should have been it's final end. If it should have a minor resurgence today, it will only be as one that some "purist" will use, as long as his computer batteries last. It would take someone with an interest in research, but I think you'll find the governing factor regarding the decline of "Lunar's" was the common use of the chronometer, not the "time tick" ..... the time tick just made the chronometer more reliable. otn |
#128
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Navigation Question
BAILIFF(Spoken)
Mr. Flynn, his honor is here BILLY(Spoken) Thank you. Just a moment. You ready? ROXIE(Spoken) Oh Billy, I'm scared. BILLY(Spoken) Roxie, you got nothing to worry about. It's all a circus, kid. A three ring circus. These trials- the wholeworld- all show business. But kid, you're working with a star, the biggest! (Singing) Give 'em the old razzle dazzle Razzle Dazzle 'em Give 'em an act with lots of flash in it And the reaction will be passionate Give 'em the old hocus pocus Bead and feather 'em How can they see with sequins in their eyes? What if your hinges all are rusting? What if, in fact, you're just disgusting? Razzle dazzle 'em And they;ll never catch wise! Give 'em the old BILLY AND COMPANY Razzle dazzle 'em Give 'em a show that's so splendiferous BILLY Row after row will crow vociferous BILLY AND COMPANY Give 'em the old flim flam flummox Fool and fracture 'em BILLY How can they hear the truth above the roar? BILLY AND COMPANY Throw 'em a fake and a finagle They'll never know you're just a bagel, BILLY Razzle dazzle 'em And they'll beg you for more! BILLY AND COMPANY Give 'em the old razzle dazzle Razzle Dazzle 'em Back since the days of old Methuselah Everyone loves the big bambooz-a-ler Give 'em the old three ring circus Stun and stagger 'em When you're in trouble, go into your dance Though you are stiffer than a girder They let you get away with murder Razzle dazzle 'em And you've got a romance Give 'em the old Razzle Dazzle BILLY Razzle dazzle 'em Give 'em an act that's unassailable They'll wait a year 'till you're available! BILLY AND COMPANY Give 'em the old Double whammy BILLY Daze and dizzy'em Show 'em the first rate sorcerer you are BILLY AND COMPANY Long as you keep 'em way off balance How can they spot you got no talents? BILLY Razzle dazzle 'em COMPANY Razzle dazzle 'em BILLY Razzle dazzle 'em BILLY AND COMPANY And they'll make you a star! OzOne wrote in message ... On Tue, 24 Feb 2004 02:51:38 GMT, felton scribbled thusly: An evasive and inaccurate reply. I detect a pattern. Ahh the story of Jocks life "Give em the old razzle dazzle" Give 'Em The Old Razzle-Dazzle by Sarah E Edgson Any sexual fantasy involving such assorted paraphenalia as washing-up liquid, a blender, and a bichon frise just doesn't quite cut the mustard with me. http://www.write101.com/lust.htm He's learned from experts THEY DANCE, THEY SPIN: Ari lets it all hang out as he sums up his time with the Bush administration. "We just give 'em the old flim flam flummox," bellowed Rumsfeld, "Fool and fracture 'em. How can they hear the truth above the roar? Throw 'em a fake and a finagle. They'll never know you're just a bagel. Razzle dazzle 'em. And they'll beg you for more!" The Press Secretary was then queried about how it is that President Bush's popularity is still so high. Fleischer directed the press corps' eyes to a T.V. screen where President Bush spoke via satellite. "Back since the days of old Methuselah, everyone loves the big bambooz-a-ler. Give 'em the old three-ring circus. Stun and stagger 'em. When you're in trouble, go into your dance. Though you are stiffer than a girder, they let ya get away with a murder. Razzle dazzle 'em, and you've got a romance. Give 'em an act that's unassailable. They'll wait four years 'til you're available!" Asked about the steady erosion of civil liberties, Bush responded, "Just give 'em the old double whammy. Daze and dizzy 'em, show 'em the first rate sorcerer you are. Long as you keep 'em way off balance, how can they spot you got no talents? Razzle dazzle 'em and they'll make you a star!" http://www.lalatimes.com/Issue7/razzle.html Oz1...of the 3 twins. I welcome you to crackerbox palace,We've been expecting you. |
#129
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Navigation Question
"otnmbrd" wrote in message news:Hgz_b.5818
G Think you just pulled an "otn". I think it was extensively used around 1800, but had fallen to a point of much less use by 1900. You're right in the sense of "anyone who really needs to know the longitude, or correct time, uses Lunar distances." However, I suspect that the vast majority of mariners simply found their latitude, and went east or west from there. It was only 30 years earlier the Captain Cook used Lunar Distances and was hailed as a great surveyor for his accomplishments. His work was based on Maskelyne's lunar distance methods which were published in 1762. |
#130
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Navigation Question
Fort Schuyler, right on City Island, New York.
The New York State Merchant Marine Academy. A member of SUNY. You already knew that as you moored your boat there. Remember when you towed Nutsy home G That was when he had the Pearson Remember Nutsy :^) That was before he got his Sailfish. That was in the days when you had to use shackles on the Dock cleats for mooring lines Where was the Jax living then? That I can't seem to remember. Must be old age but you younger guys should remember. Remember you used to drive from Kew Gardens to Brooklyn to pick up one of your female crew. What was that on the Beltway, 30 miles round trip and another to drop her off. Those were the days of the Lesbians!! I guess Susy straighten that out Was it you or Jax that did the valve jobs on the cars in the back yard. It was one of you. I'll sign off now but we'll travel down memory lane so more later. Ole Thom |
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