> The yearly angle variation of the midday sun is the same everywhere
> on the globe

> The earth is tilted about 23.5 deg, so you will see a variation of twice
> that everywhere (outside the polar regions as noted above).

If you look at the equator example, Quito, you'll see that the variation
is only 23 degrees

89.8 [Mar 19], 66.8 [Jun 20], 90.0 [Sep 23], 66.9 [Dec 21] and day
length [sunrise - sunset] of 12 hours and a few minutes

> For example, I'm at about 42.5N so the height of the midday sun
> varies from 42.5 + 23.5 =3D 66 deg at the summer solstice, to 42.4
> deg at each equinox, to 42.5 - 23.5 =3D 19 deg at the winter solstice

In Boston, according to

http://www.timeanddate.com/worldclock/astronomy.html?n=3D43&month=3D3&year=
=3D2010&obj=3Dsun&afl=3D-1&day=3D1

24.3 [Dec 21] to 71.1 [Jun 20] =3D 46.8 difference

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