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UPDATES.TXT
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===========================================================
UPDATES.TXT
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CyberSky 3.2.1 Shareware Version February 15, 2001
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UPDATES
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Changes introduced since the release of CyberSky 3.0
include:
CYBERSKY 3.2.1 (FEBRUARY 15, 2001)
- CORRECTION: The orientation of the rings of Saturn was
sometimes not being calculated correctly.
- CORRECTION: The beginning and ending times of civil,
nautical, and astronomical twilight were not being
calculated correctly.
- CORRECTION: The ending times of civil, nautical, and
astronomical twilight were under certain circumstances
not being displayed correctly in the Twilight Data dialog
box.
CYBERSKY 3.2 (SEPTEMBER 28, 2000)
- ENHANCEMENT: Added the Initial View command to the
Options menu, which allows the application's initial view
to be set. You can now specify whether you want CyberSky
to start up with the standard north, east, south, west,
or zenith view.
- ENHANCEMENT: Added the Deep Sky Objects section to the
application's Help file. The first topic in this section
provides information about the deep sky object catalogs
used by CyberSky. The other five topics describe the
classifications of galaxies, globular clusters, open
clusters, bright nebulae, and planetary nebulae displayed
in the Deep Sky Object Data dialog box.
- CORRECTION: The proper motions of stars were not being
calculated correctly. Specifically, the right ascension
components of proper motion were too small.
- CORRECTION: The magnitude of Saturn displayed in the
Planet Data and Planets Data dialog boxes was not
correct. The code used to calculate this value did not
take into account the light reflected by the planet's
rings.
- CORRECTION: The position of the galactic equator was not
being calculated correctly. The galactic equator was not
fixed with respect to the background stars, but would
instead move across the celestial sphere over time.
- CORRECTION: Searching for horizontal coordinates near the
horizon when in horizon mode failed to center the correct
coordinates. Atmospheric refraction calculations were
being performed when they should not have been.
- MODIFICATION: Various commands that were previously
disabled during full screen mode, animation, or real time
mode are no longer disabled. If you use a command that
requires that full screen mode, animation, or real time
mode be turned off, CyberSky will alert you with a
message box, and you will have the option to continue or
to cancel the command.
- MODIFICATION: If animation was left running for a while,
or the animation time step was set to a large value, the
date could reach a value far outside CyberSky's allowed
range of 4000 BC to 4000 AD. This not only resulted in
completely incorrect sky charts, but also could cause the
application to crash. To prevent this from happening,
animation is now automatically turned off if the date
goes too far outside the allowed range.
CYBERSKY 3.1 (FEBRUARY 24, 2000)
- ENHANCEMENT: Increased the speed at which stars,
constellation figures, deep sky objects, and solar system
objects are drawn. This is especially noticeable at high
zoom levels. When only stars and solar system objects are
displayed, animation at 32X is about five times faster
than before. When locked on Jupiter, animation at 512X is
about seven times faster than before. When locked on
Saturn, animation at 4096X is about four times faster
than before.
- ENHANCEMENT: Added the Zodiacal only box to the
Constellations dialog box, which allows only zodiacal
constellation figures to be displayed.
- ENHANCEMENT: Added the Copy button to the Planets Data
dialog box, which allows the data displayed by this
dialog box to be copied onto the clipboard, pasted into
an editor or word processor, and then saved to a file or
printed.
- CORRECTION: The equatorial coordinates at the center of
the sky chart were not calculated correctly when horizon
mode was turned on and the horizon was displayed. This
was due to a bug in code that reverses the effects of
atmospheric refraction. This caused a number of problems
that became noticeable at very high zoom levels,
especially when the viewpoint was near the horizon.
Objects that should have been displayed were not
displayed. Grids and lines were only partially displayed,
or were not displayed at all. The equatorial coordinates
displayed in the Pointer bar were not correct.
- CORRECTION: The lines that make up the constellation
figures were sometimes not displayed correctly. This was
due to a bug in code that performs line clipping, and
occurred only at very high zoom levels.
- CORRECTION: The sun and moon were sometimes displayed
when they were in fact not visible in the area of sky
being displayed. This was due to a bug in code that
converts equatorial coordinates to screen coordinates,
and occurred only at very high zoom levels.
- CORRECTION: The dark parts of solar system object disks
were not printed correctly. When the sky chart was
printed in black and white, the dark parts of disks were
not filled, which allowed objects, grids, and lines to be
seen through them. When the sky chart was printed in
color, the dark parts of disks were filled with the same
colors used to fill the light parts, which caused the
objects to always appear as if they were at full phase.
CYBERSKY 3.0.3 (OCTOBER 14, 1999)
- ENHANCEMENT: Added the Keyboard Shortcuts, Ordering
Information, and Registration Benefits commands to the
Help menu to make it easier to access the associated
topics in the program's Help file.
- CORRECTION: The Save Bitmap command on the File menu was
disabled if the program could not find an available
printer at startup.
- CORRECTION: The popup menu that appeared when a Messier
object fainter than magnitude 8.5 was right-clicked did
not include an About command for that object. This made
it impossible to display the Deep Sky Object Data dialog
box for that object.
- MODIFICATION: When the program starts up in horizon mode,
it now displays the sky above the south horizon if the
location is on or above the equator, or above the north
horizon if the location is below the equator. Previously,
the program always displayed the sky above the south
horizon at startup.
- MODIFICATION: When the animation time step is set to one
or more years, the size of each step is now adjusted so
that the year changes during animation but the month and
day remain the same. Previously, the size of each step
was constant, which caused the month and day to change
during animation due to the addition of leap days to the
calendar.
CYBERSKY 3.0.2 (JULY 29, 1999)
- CORRECTION: The Deep Sky Object Data dialog box did not
correctly classify open clusters; they were instead
classified as globular clusters.
CYBERSKY 3.0.1 (JUNE 10, 1999)
- CORRECTION: The Left and Right commands did not scroll
the sky chart correctly when atlas mode was turned on.
The Left command scrolled the sky chart to the right
rather than to the left, and the Right command scrolled
the sky chart to the left rather than to the right.
- CORRECTION: A system resource leak occurred when the path
of a solar system object was displayed with date or time
labels. This caused the amount of free system resources
to drop each time the sky chart was drawn. If this system
resource leak continued, it eventually caused the program
to stop functioning correctly.
- CORRECTION: The data displayed in the Seasons Data dialog
box did not reflect the fact that the four seasons start
at different times of the year in the Southern Hemisphere
than they do in the Northern Hemisphere.