Plants leaning toward Sun.

[David Lloyd-Jones]

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.