Local Noon - Page 2 - SailNet Community
Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.

Reply
 
LinkBack Thread Tools
post #11 of 26 Old 04-06-2011
Member
 
Join Date: May 2006
Posts: 30
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Quote:
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.
Tea-Rex is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 26 Old 04-06-2011
Senior Member
 
AdamLein's Avatar
 
Join Date: Nov 2007
Location: SF Bay area
Posts: 1,923
Thanks: 6
Thanked 6 Times in 5 Posts
Rep Power: 8
 
Quote:
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.

s/v Laelia - 1978 Pearson 365 ketch
s/v Essorant - 1972 Catalina 27
AdamLein is offline  
Quote Quick Reply Share with Facebook
post #13 of 26 Old 04-06-2011
Sunsets and Warm Beer....
 
LandLocked66c's Avatar
 
Join Date: Dec 2009
Location: The Bottom of a Pint Glass...
Posts: 2,111
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
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!

1971 23' Oday Pop Top
S/V Frida

You can't steer a boat that isn't moving? Just like a life - P. Lutus
LandLocked66c is offline  
Quote Quick Reply Share with Facebook
post #14 of 26 Old 04-06-2011
Senior Member
 
Boasun's Avatar
 
Join Date: Feb 2007
Location: New Orleans, LA
Posts: 3,070
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 10
   
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.

1600 Ton Master, 2nd Mate Unlimited Tonnage

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maritime Instructor
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Rapture
Boasun is offline  
Quote Quick Reply Share with Facebook
post #15 of 26 Old 04-06-2011
Senior Member
 
AdamLein's Avatar
 
Join Date: Nov 2007
Location: SF Bay area
Posts: 1,923
Thanks: 6
Thanked 6 Times in 5 Posts
Rep Power: 8
 
Quote:
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.

s/v Laelia - 1978 Pearson 365 ketch
s/v Essorant - 1972 Catalina 27
AdamLein is offline  
Quote Quick Reply Share with Facebook
post #16 of 26 Old 04-06-2011 Thread Starter
Senior Member
 
dnf777's Avatar
 
Join Date: Jun 2007
Posts: 320
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Quote:
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.

Last edited by dnf777; 04-06-2011 at 05:24 PM.
dnf777 is offline  
Quote Quick Reply Share with Facebook
post #17 of 26 Old 04-06-2011
Sunsets and Warm Beer....
 
LandLocked66c's Avatar
 
Join Date: Dec 2009
Location: The Bottom of a Pint Glass...
Posts: 2,111
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Quote:
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.

1971 23' Oday Pop Top
S/V Frida

You can't steer a boat that isn't moving? Just like a life - P. Lutus

Last edited by LandLocked66c; 04-06-2011 at 05:40 PM.
LandLocked66c is offline  
Quote Quick Reply Share with Facebook
post #18 of 26 Old 04-07-2011
Old as Dirt!
 
svHyLyte's Avatar
 
Join Date: Nov 2008
Location: Tampa Bay Area
Posts: 2,937
Thanks: 15
Thanked 130 Times in 123 Posts
Rep Power: 7
 
Quote:
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 97 30.00' W

FWIW...

"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."

Last edited by svHyLyte; 04-07-2011 at 08:38 AM.
svHyLyte is offline  
Quote Quick Reply Share with Facebook
post #19 of 26 Old 04-07-2011
Senior Member
 
Boasun's Avatar
 
Join Date: Feb 2007
Location: New Orleans, LA
Posts: 3,070
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 10
   
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.

1600 Ton Master, 2nd Mate Unlimited Tonnage

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maritime Instructor
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Rapture
Boasun is offline  
Quote Quick Reply Share with Facebook
post #20 of 26 Old 04-07-2011
Senior Member
 
Join Date: Dec 2008
Location: Chesapeake
Posts: 474
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Quote:
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.
lapworth is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking For Local Knowledge San Francisco? PearsonCommander General Discussion (sailing related) 7 02-15-2009 03:03 AM
Re: Some Local Wind Observations NewsReader Mass Bay Sailors 0 03-06-2007 05:15 PM
NY Local Delivery tonylitvak Crew Wanted/Available 3 10-18-2004 04:10 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome