Re: size

bifoley@yahoo.com Sep 12, 2001

The commands are there so you can tailor the size of the stars to what
works for you. It is NOT a cookie-cutter program.

--- In guide-user@y..., "kpo.v" <gorlin@t...> wrote:
> Look at the design of Cartes du Ciel, how handle the star dots and
magnitudes in a excellent way, why do you must do all this commandos
in Guide for to get a acceptable star chart?
> hans-goran
> ----- Original Message -----
> From: "Laurent Zimmermann" <lzmn@s...>
> To: <guide-user@y...>
> Sent: Tuesday, September 11, 2001 8:04 PM
> Subject: Re: [guide-user] size
>
>
> > Hi Hans-Goran,
> >
> >
> > The human eye is able to adapt to very different brightnesses as
Venus
> > (mag -4) and weak stars (mag 6); that represents a difference of
10 mag,
> > that is to say a brightness ratio of 10,000. A computer's display
is only
> > able to give 256 levels of brightness. So it is impossible to
render the
> > stars' brightnesses in a so-called "realistic way".
> >
> > As a consequence, some "conventions" have to be accepted, e.g. the
> > diameters of the stars are linked to the magnitude.
> >
> > In the case of the Sun and the Moon, such a convention is
unapplicable,
> > because these bodies have apparent diameters. For these, the
diameter of
> > the disk is linked to their actual angular diameter.
> >
> >
> > Laurent Zimmermann
> > http://users.skynet.be/zmn/cab
> >
> > ----- Original Message -----
> > From: H.G.Lindberg <gorlin@t...>
> > To: <guide-user@y...>
> > Sent: Monday, September 10, 2001 6:18 PM
> > Subject: [guide-user] size
> >
> >
> > > The size of star dots and levels in Guide ,driving me
crazy......
> > > How get automatick size of star dots versus magnitude in a
realistic
> > > way????
> > > (Vega is bigger then our sun! :o))
> > > Regards
> > > Hans-Goran
> > >
> > >
> > >
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> >
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