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alanji
Lifetime Member
Joined: Sep 04, 2006
Posts: 179
Location: Somerset
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 Posted: Sun Dec 07, 2008 6:09 pm Post subject: |
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| M8TJT wrote: | | alanji wrote: |
However it reminded me that each degree of latitude equates to 4 minutes of time - useful for a quick estimate of sunrise/sunset using TomTom. Of course the actual time will also vary when travelling North or South (unless it is the spring or autumn equinox!). Cannot remember how to calculate that - too long since my mathematics and astronomy days! |
Surely each degree of longitude = 4 mins. 1 hour = 15 degrees. and the time is surely the same as you travel N/S. It varies as you travel E/W. It's 12 oclock anywhere on (say) the Grenwich meridian when it's 12 oclock at Grenwich.
As a quick reminder Lattitude is Up/Down and longitude is Left/Right on a map orientated north up.
Edit PS. You've pinched 'my' avtar   |
Oh Gawd  That will teach me to read my replies more carefully.
The time is the same as you travel N/S but sunrise/sunset will vary (except on the equinoxes when everywhere has 12 hours of day/night). I should have made my meaning clearer in my post.
I have 'pinched.' your avatar - I chose it as it is the one that looks most like me! We'll have to agree to post on different boards!
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Alan
Go 750 LIVE Europe Map 870.3406
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Sun Dec 07, 2008 6:47 pm Post subject: |
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| alanji wrote: |
I have 'pinched.' your avatar - I chose it as it is the one that looks most like me! We'll have to agree to post on different boards! |
No need for that.  I chose it for the same reasons. |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Mon Dec 08, 2008 12:04 am Post subject: |
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Can't one of you change the colour of the hat or something?  |
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alanji
Lifetime Member
Joined: Sep 04, 2006
Posts: 179
Location: Somerset
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| Posted: Mon Dec 08, 2008 5:54 pm Post subject: |
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| Andy_P wrote: | | Can't one of you change the colour of the hat or something? |
I have trimmed my beard and wear a cowboy hat but the avatar has not done likewise!! 
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Alan
Go 750 LIVE Europe Map 870.3406
Go 720 W Europe Map 865.3245
One XL W Europe. Map 715.1689
Dell Axim & TT3
Psion 5mx & Routeplanner |
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garcor
Regular Visitor
Joined: Feb 10, 2008
Posts: 114
Location: Nova Scotia & Florida in Winter Go 920 App 8.351 Maps NA 850 & C/W EU 830
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| Posted: Mon Dec 08, 2008 7:21 pm Post subject: |
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| Or if you want to add a position to your favorites and you do this while you are still connected to your computer you could always use a program like this |
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