Well, once again the horizon issue. I agree completely with John Mahony's
opinion.
Long ago I suggested Patrick to improve the way to define a realistic local
obstruction horizon line. Of course I don't refer to a fantasious paradisiac
picture, but an astronomical serious useful limit of what is up over my horizon
and the exact moment when the object disappears, in order to follow fenomena
that are close the horizon.
When somebody has buildings nearby, in the current CdC definition they get a
big problem of lack of parallelism on the screen between the vertical walls of
the building. According to the zooming, the walls converge as much as sometimes
both walls crosses between them. The suggestion was to allow the definition of
the vertical lines by two points of different height with the same azimut. This
will provide near parallel vertical lines.
Also to better define the small accidents (close changing points of the real
horizon) it would be useful to allow entering the azimuths by floating point
numbers. Now they are integer numbers and too coarse for a detailed obstruction
line.
In my opinion, such a wonderful program deserves a horizon line with
astronomical precision, not a picture of landscape useful for other purposes
but not for astronomers. If you allow me to say it as a reference, the
definition of the horizon in Hnsky is one of the best I have ever experienced
as it includes both above mentioned suggestions.
Patrick promised me to review the horizon drawing for the version 3. I hope
he'll remember it and give us not artistic but astronomical horizons for fixed
observing sites.
Antoni Clavell
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