> It does work with the full year, you just have to get the order of stuff=
=20
> right. I tried it with your first example and got 319 - for N3:
>
> 1 + ((2010 - 4 * (floor(2010 / 4) + 2) / 3)
> =3D 1 + ((2010 - 4 * (502) + 2) / 3)
> =3D 1 + ((2010 - 2008 + 2) / 3)
> =3D 1 + (floor(4/3))
> =3D 2
>=20
> N =3D 336 - (1 * 2) + 15 - 30 =3D 319

Well, I really did think I had the operator precedence correct

( ) * / + -

By "my" order

(floor(2010 / 4)+2) is worked first =3D 504

then 504 * 4 =3D 2016, then 2016 / 3 =3D 672

Your line

1 + ((2010 - 2008 + 2) / 3) =3D 1 + 4/3

by "my" order would give the result

1 + ((2010 - 2010)/3) =3D 1 + 0/3

because the ( ) outside 2010 - 2008 + 2 have precedence over /3

> There is an example here:
> http://williams.best.vwh.net/sunrise_sunset_example.htm

Thanks. That's helpful in seeing how the rules were bent (IMVHO)
to get the right answer

Harumph ;-)

Joe
--=20
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