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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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