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Plants leaning toward Sun.

michael frankis michael.frankis at which.net
Sat Sep 4 07:06:08 EST 1999

David Lloyd-Jones wrote:

> Alfred Falk <falk at arc.ab.ca> wrote >
> > Need an astronomy lesson here.  It is true that the as you go higher in
> > latitude, the sun appears lower in the sky.  However, it also makes a
> > wider arc around the horizon in summer and shorter in winter.  (As not
> > much growth takes place in winter, we only need to consider summer.)
> > The extreme point is that at the pole the sun rises at spring equinox
> > and sets at autumn equinox (assuming idealized point sun and no
> > atmospheric effects).  The sun then appears to move all the way around
> > the sky in one day.  As you drop in latitude below the arctic circle,
> > the sun increasing dips below the horizon on the north side.
> >
> The suspense is unbearable: do sunflowers above the Arctic circle strangle
> themselves?
> Did bindweed evolve above the Arctic Circle and then move south? :-)
>                                                                 -dlj.

And who's going to build a greenhouse on the polar ice cap?!  :-)


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