Zon Mosaic Pro5 User's Guide Page 44

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44 Starry Night User’s Guide
6 Open the “Limit by Distance Options”
dialog box for stars. Check “Limit stars by
distance” and set the distance range from
140 to 170 light years, the distance of the
Hyades cluster. This will cause almost all
stars that do not belong to the cluster to
disappear, leaving only stars in the Hyades
cluster, all with proper motion vectors
pointing in the same direction. Those few
stars with vectors pointing in different
directions (likely not cluster members) are
now very easy to identify.
Star Brightness, Contrast &
Colour
Starry Night gives you complete control
over the brightness, contrast, and colour of
star display. To access these options,
choose Preferences from the File menu
(Windows) or the Starry Night menu
(Macintosh) and select
Brightness/Contrast from the dropbox in
the upper left corner of the Preferences
dialog box.
The Star type dropbox lets you choose
from several different types of star images.
This preference will be applied to every
star drawn onscreen. Try testing out each
of these different star images and seeing
which one you prefer.
The “Min/max star size” slider determines
how large stars appear onscreen.
The Range slider increases or decreases
the size distinction between the brightest
and dimmest objects in the sky, while the
Contrast slider increases or decreases the
colour distinction between the brightest
and dimmest objects in the sky. If you’re
viewing from an urban location, you may
want to decrease the contrast so that Starry
Night’s display is closer to your physical
view. If you’re viewing from a rural
location, you can increase the contrast to
view a more diverse night sky.
A stars colour is determined by its surface
temperature, ranging from blue (hottest) to
red (coolest). The Colour slider increases
and decreases the extent to which Starry
Night displays star colour. Pulling the
Colour slider to the right shows more and
more of the full spectrum of star colours,
to an extent you would never see from
Earth. Pulling the Colour slider to the left
strips away colour distinctions until all
stars appear white.
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