[time-nuts] Local Solar Time Clock
Bob Camp
lists at rtty.us
Sun Jan 19 18:41:37 UTC 2014
Hi
I’d bet that you can do some sort of simple fit to +/- 3 days from today and get a reasonable estimate of the rate. Exactly what you would fit might vary over the year.
Bob
On Jan 19, 2014, at 1:05 PM, Jim Lux <jimlux at earthlink.net> wrote:
> On 1/19/14 9:40 AM, David J Taylor wrote:
>> From: Jim Lux
>> Right now, the EOT is changing almost 30 seconds/day, which implies that
>> the clock could be some seconds off during part of the day (although
>> "true" at noon).
>> []
>>
>> 30 seconds/day?
>>
>> http://www.sundials.co.uk/pix/c/eot3.gif
>> from:
>> http://www.sundials.co.uk/equation.htm
>>
>>
>
> http://www.wsanford.com/~wsanford/exo/sundials/equation_of_time.html
>
>
> 5 Jan 5.2 minutes
> 6 Jan 5.7 minutes
>
> 30 seconds in a day..
>
> The total variation over the year is +/- 15 minutes, but the derivative is a lot bigger at some times of the year (now)
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