How about any south facing wall during equinoxes?

Dan


On Tue, Jun 14, 2016 at 6:39 PM, Frank King <[email protected]> wrote:

> Dear Willy and Geoff,
>
> Good answers but the correct value
> exceeds both your scores.
>
> Let's see who else will rise to the
> challenge before I declare my hand!
>
> Frank
>
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