[NatureNS] Sunrise and sunset changes

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Date: Sat, 04 May 2013 19:33:23 -0400
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You are right. Wonder how I came up with the wrong answer.

I could not find a web site that had it to the second. The USNO site has
a display for a whole year. The variation in speed is not nearly as
great as I thought. Anther mistake I made.

--
Gerald

On 5/4/13 6:13 PM, John and Nhung wrote:
> That's always been my understanding as well, with day length changing most
> rapidly during the equinoxes (bad Latin, I know!) and most slowly during the
> solstices.
> 
> -----Original Message-----
> From: naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca]
> On Behalf Of David & Alison Webster
> Sent: May-04-13 6:38 PM
> To: naturens@chebucto.ns.ca
> Subject: Re: [NatureNS] Sunrise and sunset changes
> 
> Hi Gerald & All,                    May 4, 2013
>     Just a guess, but I think the most symmetric curve would be day length
> as opposed to change in sunrise and sunset over time because rise & set
> curves will be distorted (I think) by the analemma effect.
>     If you look at the projection of the elliptic on a globe you will see
> that slope (dy/dx) is maximal at the equator (equinox) and decreases to zero
> at the solstices. Consequently I would expect daily change in daylength to
> be maximal at the spring and fall equinox (equinix ?) because daylength will
> be a function of displacement from the equator. Almanacs don't show this
> clearly because values are rounded usually to the nearest minute.
> Yt, DW
> ----- Original Message -----
> From: "Gerald" <naturens@zdoit.airpost.net>
> To: <naturens@chebucto.ns.ca>
> Sent: Saturday, May 04, 2013 3:45 PM
> Subject: [NatureNS] Sunrise and sunset changes
> 
> 
>> When during the year does the change in sunrise and sunset from one 
>> day to the next reach the maximum?
>>
>> --
>> Gerald

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