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CD Direkt 1995 #6
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CDD_6_95.ISO
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winanw
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skymap
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history.txt
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1994-12-21
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SkyMap Release History
----------------------
01-JAN-95 v2.2
New features added:
When displaying comets and asteroids, a limiting magnitude can now be
specified. This is useful to prevent 17th magnitude comets being
shown if you only have a pair of binoculars!
The information dialogs now all explicitly use the "Arial" font rather
than simply asking for a "default" Swiss font. The previous method
led to a strange font being used to display information on some
machines with lots of fonts installed.
If a date a long way (more than 50 years by default) from the 2000AD
"epoch" is entered, and the program is in "low precision" calculation
mode, the program will display a warning that the resulting map could
have significant errors, and will offer to switch on high precision
calculation mode before calculating the map.
The line of the ecliptic can now be displayed.
A new panel on the status bar displays the limiting magnitude of the
stars on the map.
Maps can now be saved as a Windows bitmap format (.BMP) file. This is
a much-requested feature for saving a permanent record of a map. It's
also a great way of creating Windows "Wallpaper" files!
A new View/Copy menu item now copies the contents of the currently
active view onto the clipboard, from where it can be pasted into a
word processor or other application.
SkyMap can now display on an Area Map stars (and other objects) read
from the "Hubble Guide Star Catalog" (GSC) CD-ROM database. This set of
2 CD-ROMs, published by the Space Telescope Science Institute, contains
approximately 19 million objects covering the entire sky to below
magnitude 14. This facility is NOT available in the shareware version of
SkyMap, but is provided as a new program "SkyMap/GSC", details of which
are on the registration form.
Added two new buttons to the toolbar to respectively add and subtract
half a magnitude from the limiting magnitude of the map. This gives a
quick way of rapidly changing the number of stars displayed. These
operations have F4 and Shift+F4 as keyboard shortcuts.
Added an option to automatically scale star image sizes to the limiting
magnitude of the map. This, when combined with the above facility to
rapidly alter the map's limiting magnitude, assures that maps retain a
"realistic" appearance when the magnitude limit is altered.
The program now carries out better checks to decide quickly if an
object is visible on the area map. This has reduced the time taken to
compute an area map by 25-40%, depending on the circumstances.
We now use a much more efficient method of drawing the altitude/azimuth
grid on the Horizon map. This significantly speeds up map drawing for
slow machines when the map field of view is small.
Added "Tool Tips" to the Toolbar. These are short help messages which
pop up after the mouse has been over a button for a brief period,
describing the function of that button. This feature can be disabled
using a new option on the global preferences dialog.
The N,E,S,W buttons on the horizon map toolbar now remain "pressed in"
when the map is drawn for those directions. This makes it easy to see
at a glance which (if any) cardinal direction the map is facing.
A grid of right ascension and declination lines can now be displayed on
the horizon map.
A new option on the Area Map popup menu allows the user to draw Telrad«
finder circles centred on the point clicked on. The Telrad finder is a
very popular device, and this is a much requested feature.
The program now has user-maintainable databases of eyepiece and
telescope data in files "EYEPIECE.SKY" and "SCOPE.SKY" respectively.
An "Eyepiece" item on the "Tools" menu displays the database, allowing
the user to add, edit or delete entries, and to see the magnification
and field of view resulting from using any eyepiece on any telescope.
On the area map, the field of view can be displayed as a circle on the
map with a new "Eyepiece" option on the popup menu.
The map size calculations now take acount of the presence of the tool
and status windows. The effect of this is that a maximized map window
now never has scroll bars.
The time of rise, transit and set can now be displayed for all objects
on the map, not just planets.
We now cache rise, set and transit times of planets, so they only have
to be computed (a slow process) once, appearing instantly when
displayed subsequently.
The program can now display the tracks of an arbitrary number of moving
objects at the same time. Previously, only one object at a time could
have its track shown. Tracks are also now saved with files, which
didn't happen previously.
Object track settings are now stored as a part of the Area Map defaults.
The status bar now contains a panel which displays the angular
separation of the last two points to be clicked on with the left mouse
button.
A new area map can now be drawn from an existing one by dragging a
selection rectangle with the left mouse button. It was not previously
possible to draw a new area map from an existing one.
An area map can now be drawn from a horizon map by dragging a selection
rectangle with the left mouse button. This is a much more convenient
method than the current one of pressing the right button over a point
on the map because it allows the map size, as well as the centre, to be
specified.
Bugs fixed:
On all the information dialogs, fixed the formatting problems with
angles and times which occasionally resulted in displays such as
"2m 60s" instead of "3m 0s".
On the area map, deep sky objects drawn with the "general" circle were
being drawn at twice the correct size.
On the "Planetary Phenomena" dialog, display times correctly rounded to
the nearest minute, rather than just "chopping off" the seconds.
We no longer get spurious "Identify Star" menu items appearing on the
popup menu for stars whose position has been computed, but which are
fainter than the current limiting magnitude of the map.
In the map status dialog, the sign of the observer's longitude (ie E or
W) was being set from the sign of the latitude, not the longitude.
Very odd things happened under certain circumstances when an Area Map
was printed showing the Moon with the "dark limb visible" option turned
on. These included stars being printed as hollow rather than solid
circles, and stars being labelled with a Latin rather than Greek font.
I'm still not exactly sure of the cause of this, but changing the method
used to draw the Moon bitmap appears to have fixed it.
If the horizon map was precisely centred in the window (eg if it was full
screen with no scroll bars) and we attempted a zoom, the program crashed
with a "Floating Point Invalid" error due to attempting to evaluate 0/0.
We now check for this special case and act correctly.
A missing term involving the Moon's semidiameter meant that the time
of rise and set of the Moon was about 1 minute in error.
On the area map information dialog for planets, display negative
altitudes correctly.
The horizon map "high precision" flag setting and the Moon dark limb
visibility flag weren't being correctly saved when default settings
were saved.
When computing the times of rise and set, use the local date, not the
UT date. This was causing the program to occasionally display times
for the previous or following day when used in time zones other than
GMT.
01-JUL-94 v2.1
Times of rising, meridian transit, and setting can now be calculated for
the Sun, Moon and planets. This is displayed on the "local" page of the
planet information dialog, and can also be displayed in a tabular form for
all the planets from a new "Planetary Phenomena" item on the "Tools" menu.
Added a "Planet visibility" dialog giving a quick method of showing the
positions of all the visible planets.
Added the option to label planets with names, rather than symbols. A new
planet options dialog allows selection of options for planet display.
Added an option to display the dark limb of the Moon with a dotted line.
This is