> NZ is at a fairly low latitude

Only relatively :-).
Invercargill antipodes is Bay of Biscay. Land's end is in the southern ocea=
n!.
Auckland ~ Barcelona.
Kaitaia is in Saharan Africa
Australia is the Bermuda triangle of the south pacific.
Figures :-).




and the difference between mid-day sun
> height during the year is significant
>
> Mid-summer solar noon is 76.6 degrees above the horizon, mid-winter
> solar noon is 29.7, almost 46.9 degrees difference

Half of the difference =3D~ 23.5 degrees
Cos(23.5) =3D 0.917.
ie at extremes output is down by about 8% for static versus angle changing.

Move it twice  annually so you are within say 12 degrees and Cos(12) =3D
0.978 or down by about 2% at extremes of the ranges.

That's seasonal tracking.
Daily tracking is different again.

www.gaisma.com shows you horizontal and vertical sun angle by time of
day nd day of year.
Informative.
Part of year at many sites the sun covers more than 180 degree arc in
a day. The 'must get it all' people must look over their shoulders at
days end.

Sunniest place on earth? - South and North polar regions. About 4 x as
sunny as tropical midsummer equatorial Africa :-).

In some places at some times the sun rises yesterday or sets tomorrow.


Russell
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