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Index of Subjects 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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