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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation
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Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


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  #11  
Old 04-06-2011
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Some say it's a result of a more precise geoid. I subscribe to the "England is tipping over towards Ireland" theory.
Nah, both the British AND the Irish are running away from The Continent.
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Old 04-06-2011
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Originally Posted by LandLocked66c View Post
Slightly over my head, very interesting though. Carry on gents!
Sounds scary but it's just addition. If you can figure out time zones, you can handle this. If you're interested there are lots of good websites that will give you an introduction.
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Old 04-06-2011
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I've got some Celestial Nav books I peruse from time to time. I'd be interested in seeing some intro to astronomy sites for sure!
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Old 04-06-2011
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Actually for those of you who have nothing to do with Navigation... The time zones of most countries are determined by the fifteen degree Longitude for their areas. Some time zones are slid one way or another due to political stupidity, but there is nothing I can do about that.
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Old 04-06-2011
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Originally Posted by Boasun View Post
Actually for those of you who have nothing to do with Navigation... The time zones of most countries are determined by the fifteen degree Longitude for their areas. Some time zones are slid one way or another due to political stupidity, but there is nothing I can do about that.
Actually I have a feeling that most of them have weird jagged borders.
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Old 04-06-2011
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Originally Posted by LandLocked66c View Post
So, this has to do with what exactly? Celestial navigation?
Not really. I just don't want to tune in late for the Jerry Springer show at noon!


Really, teaching myself battery-free navigation and the question just came up. I would have assumed it was a standard meridian per timezone, as pointed out since, with several degrees to and fro......except the lines aren't straight by any means to accomodate local needs.

Thanks for all the good info and trivia all.

ps....66c: if you want something to occupy even more spare time, I highly recommend a cheap, Davis Mark III sextant. I've only had mine a week, shot readings in my yard, and already want a better one! Lots of fun and learning.

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Old 04-06-2011
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Originally Posted by dnf777 View Post
ps....66c: if you want something to occupy even more spare time, I highly recommend a cheap, Davis Mark III sextant. I've only had mine a week, shot readings in my yard, and already want a better one! Lots of fun and learning.
I have a cheapy sextant, it is fun! I just don't feel like I can apply alot of the information. Seems like it's one of those things that if you aren't using it everyday it's difficult to retain the knowledge.
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Old 04-07-2011
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Originally Posted by Boasun View Post
Actually for those of you who have nothing to do with Navigation... The time zones of most countries are determined by the fifteen degree Longitude for their areas. Some time zones are slid one way or another due to political stupidity, but there is nothing I can do about that.
Well it really has nothing to do with political stupidity (tho' there's certainly no shortage of that!). Time zones were agreed upon in the age of steam (trains) as a matter of allowing train operators to set train schedules. (Pre-time zones, locales set their watches/clocks by local apparent noon. A train scheduled to arrive in Denver as 12:00 always presented the question of where 12:00 was taken. At the destination? At the point of departure? Halfway between the two?) Zone lines/times were adjusted to account for matters such as the difficulty of having a portion of a city in one zone and the rest in another, eg Corpus Christi, Tx at 97ļ 30.00' W

FWIW...
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Last edited by svHyLyte; 04-07-2011 at 08:38 AM.
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World's Time zones can be determined by taking your longitude and divide it by 15. The resultant answer is the time zone you are in. And it is either plus or minus, pending on whether you are East or West of the Prime meridian.
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Old 04-07-2011
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Originally Posted by LandLocked66c View Post
I have a cheapy sextant, it is fun! I just don't feel like I can apply alot of the information. Seems like it's one of those things that if you aren't using it everyday it's difficult to retain the knowledge.
Your finger tips are about 5 degrees which is about 20 min. Next time you watch the sunset see how many fingers you place between the horizon and the sun multiple by 20 that's how much daylight is left. Now if you know what time the sunsets you can figure the time.
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