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Just as a note, 1 arcminute equals 1 nautical mile.  Greg has the
calculation right however.

On May 19, 2006, at 1:41 PM, Greg R. wrote:

> Hi Greg (what's that echo in here?....  ;-))
>
> If you're asking why the declination of the (suppposed) pole star
> isn't
> exactly 90 degrees - well, that's because it really isn't.
>
> Polaris is close to having a 90?N declination, but it isn't exact
> and it's
> off by enough to throw off your navigtion calculations by several
> miles.
> Remember that 0.1 degree = 1 NM, so 60' - 18' = 42 NM - not exactly
> what I'd
> call "accurate" navigation, but probably close enough to help get you
> oriented if you're *totally* lost somewhere...  ;-)
>
> --
> GregR
>
>
> ----- Original Message -----
> From: "cfi@licfi.com" 
> To: 
> Sent: Friday, May 19, 2006 9:53 AM
> Subject: polaris dec
>
>
>> Question for the list:
>>
>>   Please excuse the neophite question but; Why does the USNO on-line
>> almanac show the following?:
>>
>>  declination of polaris:
>>  month        d   m
>>  may         89.17.5
>> june         89.17.4
>> july         89.17.3
>>  aug         89.17.3
>> sept         89.17.4
>>  oct         89.17.6
>>  nov         89.17.7
>>  dec         89.17.9
>> -------2007------
>>  jan         89.18.1
>>  feb         89.18.1
>>  mar         89.18.1
>>  apr         89.18.0
>>  may         89.17.8
>> june         89.17.7
>> july         89.17.6
>>
>>     Thanks,
>>         Greg
>>
>>
>> --------------------------------------------------------------------
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>>

   

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