Version 2.0.27
Version 2.0.26
Version 2.0.25
Version 2.0.24
Version 2.0.23
Version 2.0.22
Version 2.0.21
Version 2.0.20
Version 2.0.19
Version 2.0.18
Version 2.0.17
Version 2.0.16
Version 2.0.15
Version 2.0.14
Version 2.0.13
Version 2.0.12
Version 2.0.11
Version 2.0.10
Version 2.0.9
Version 2.0.8
Version 2.0.7
Version 2.0.6
Version 2.0.5

Problem fix: C2A now checks that the orbital elements fields from the MPC are not empty. En error in the MPC format (empty semi major axis) was inducing a crash in C2A when positions were displayed after the orbital elements were imported.
Problem fix: syntax in the VizieR USNO-B1.0 query has changed. The field names e_RAJ2000 and e_DEJ2000 must be used in place of e_RAdeg and e_DEdeg. The protocol syntax change is now taken into account into C2A.
Problem fix: a double click in an empty element of the user or observation image list was crashing the application.
Problem fix: when Equinox was changed into the planetary position options, this change was not immediatly taken into account.

When C2A is launched from the Occult Watcher software, one checks if a previous instance of C2A is already running. If it is the case, and if the correct option is set in the C2A Add-in options, the existing instance of C2A is used to display the occultation map. Version 0.44 of the C2A Add-in for Occult Watcher is required to benefit from this option.
An option has been added in the C2A Add-in for Occult Watcher in order to force the display of the NOMAD catalog whatever is the catalogue referenced in the occultation event (Tycho-2, Hipparcos, UCAC2, ...). Version 0.44 of the C2A Addiin for Occult Watcher is required to benefit from this option.
A tool has been added (command "User Images & Obs..." in the "Images" menu) that allows the user to easily manage and access its own images and observations under the form of a list.
A problem has been fixed with the decimal separator in the case some particular Windows Regional Settings were used (e.g. German (Swiss)).

The NOMAD catalog is now taken into account (short and full versions).
It is now possible to display labels in the maps which are iether object names, magnitudes or both.
An issue has been fixed in the filling process below the horizon.
The icons associated to images and C2A configuration files were not included in the distribution. This is now fixed.
It is now possible to associate user observation images to objects in the maps.
Symbols "Image" and "Observation" can be displayed in the maps.
The interface with Occult Watcher has been improved (occultation description is added in the printing legend, symmetries, field rotation, time shift and verification of the C2A version have been added).
The Registery key where C2A parameters are stored has been changed in the English version ("C2A for Windows") except if the French key already exists ("C2A pour Windows").

The Hipparcos catalogue is now available natively within C2A (it can be downloaded from the Catalogues page).
A tool has been added to view the ecliptic positions of planets, asteroids and comets (Tools menu).
C2A has been modified so that it can be directly launched from a plugin integrated within the OccultWatcher software.
A problem has been fixed in the query to the online version of the USNO-B1.0 catalogue (a change has been made in the VizieR syntax).
It is now possible to modify the font size in the user image information zone.
User locations can now be defined in a separate file and accessed through keyboard shortcusts (Ctrl+0 to Ctrl+9). This file must be called User.loc and be stored within the C2A installation directory.
All the C2A temporary files are now stored in a user directory in order to better take into account Windows Vista UAC requirements.

A problem has been fixed in the display of the Milky Way. Filling was not always done properly and field symetries were not always taken into account.
It is now possible to search asteroids and comets by their name in the Quick Search zone.
C2A now offers the possibility to export the objects displayed in the current view in a text file (command Export Objects... in the File menu).
The COM ports available on the machine are now automatically detected.
New formats are taken into account in the Telescope Tracking Analysis tool. These are the formats produced by the software products Guidemaster, CCDSoft and MaxIM DL.
Field Markers can now be saved and loaded from the Field Marker tool.

A Control Panel is added on the left side of the main window. This panel contains information about the identified objects in the map. It also allows the user to perform a quick search on an object and to define a field. Several options are associated to this control panel.
The USNO-B1.0 is now supported. It is accessed directly through the Internet on the VizieR server from the Centre des Données Astronomiques de Strasbourg.
A new command has been added to display a full screen view (in the Display menu).
The latest version of the RNGCIC catalogue is taken into account (April 2007).
A bug has been fixed in the Milky Way display.
Several buttons have been added in the main toolbar: full screen view, control panel display and object label display.
The main toolbar icon selection tool has been improved.
A bug has been fixed in the asteroid and comet position calculation when using the BDL98 polynom file.
Ctrl+F6 is now associated to the action of copying the current view in the clipboard (Ctrl+C is freed to copy text in the clipboard from the Control Panel).
Ctrl+F7 is now associated to the action of capturing the current view (Ctrl+V is freed to paste text in the Control Panel text fiields)..
Tycho-2 and USNO-B1.0 objects can now be searched in the quick search zone.
It is now possible to purge all the background images from the C2A cache folder.
A bug has been fixed in the import process of the Astorb orbital elements.

A new tool is now available to help focusing a camera at the focus of a telescope.
A new version of the Tycho-2 catalogue is available in the Catalogues page. This version includes the Tycho-2 supplement catalogues.
An option has been added to mark the user objects in the maps. Maj+Ctrl+U is a shortcut to toggle this option.
Management of objects from user catalogues has been improved.
Window positions are now verified when launching C2A. It could happen that a window is wrongly positionned out of the screen.
The supplement catalogues "suppl_1" and"suppl_2" of the Tycho-2 catalogue have been added.
A bug has been fixed when saving the window position and size while C2A was minimized in the task bar.
The formats PPM, PGM and several Digital Camera raw formats are now supported. This is achieved through a slighlty modified version of the DCRAW program.
A bug has been fixed in field symetry management. This bug showed up when the user navigated between the horizon and field types of view.
A bug has been fixed that occurred when the decimal separator cas changed in the Windows Regional Settings. The next launch of C2A could result in an application crash.
A bug has been fixed in the computation of the comet magnitudes. An error has been introduced in the fomula that comutes magnitude from the absolute magnitude and slope parameters.
A buuton has been added in the Tool Bar to display oir hide user catalogues more easily.
The LEDs that show the status on magnitude filters at the bottom of the screen are now active as soon as user catalogues are loaded.
A bug has been fixed in the management of the icons for the main toolbar.

Catalogues Guide Star and Tycho-2 are now available for download in the Catalogues section.
A bug is fixed in the comet tail direction display.
A bug is fixed in the date increment and decrement using the + and - keyboard keys.
By default, variable sky backgground color (depending on local time and Moon phase) is not displayed.
In the telescope interface, it is now possible to specify a calibration or slew point using azimut / altitude coordinates. This is handy for calibrating a telescope on a know horizon point.
Because of the new user images function, a bug was introduced when identifying UCAC1, UCAC2 or Tycho-2 objects. This is now fixed.

Sky background color can change according to the time of the day as well as Moon phase and position.
The keyboard key "Z" displays a field type view (with North at the top of the map by default) centered on zenith.
The CCD main field marker can now be rotated. Furthermore, a guiding camera field marker has been added.
It is now possible to associate images to database objects (see the Information section).
A problem has been fixed regarding the display of grayscale JPEG images.
Field border management has been improved.

A problem with the restore point creation under Windows XP is fixed.
A zoom function has been added to the image processing tool.
Milky Way is displayed in the maps.
Main diffuse nebulae shapes are displayed in the maps.
The SLP98 Theory from the IMCCE is used to calculate accurate planetary positions between 1987 and 2020.

ASCOM telescopes and focusers are taken in charge by C2A.
A new function called "Restoration Point" has been added to the "File" menu. This allows the user to save a default configuration and to easily restore it with the utility "Reset.exe" in case of a problem when launching C2A for Windows.
Audecom native focus is now taken in charge.
A new command "Telescope Manual Swing" has been added to the "Telescope" menu for managing German Equatorial mounts.
A bug has been fixed: the telescope target could be lost when performing a zoom on the map.
A bug has been fixed in the Tycho-2 proper motion calculation.
An option has been added to take into account or not the Tycho-2 proper motions.
A new version of the database compiler DC (1.0.17) is available. The argument -prefix="<string>" has been added to the command USER_FIELD in order to define a string that will be used as a prefix for the object name in the object identification window (the object name is the user firld value). The documentation (in French) has been updated to reflect this change.

Mouse wheel is taken in charge in the Image Processing window.
JPEG format is supported in the Image Processing tool.
A bug is fixed in the list that displays months within the Calendar dialog box.
SAO Synthetic Stars can now be displayed in color.
Current star and deep sky object catalog names are displayed in the top right corner of the map.
Comets are displayed with a tail in the opposite direction from the Sun.
The author email address has changed. See the Support page).
A problem is fixed when charging a C2A configuration file.
Two icons for image management are added in the tool bar.

A bug is fixed in the calendar to specify dates in orbital elements.
Bug fixed in object visibility window. The rise, set and transit times could be negative.
The raw IAU format (MPC)is now taken into account for asteroid and comet orbital element format.
It is now possible to import orbital elements into C2A directly from the Clipboard.
Warning: Help System is only available in French.

The mouse wheel can now be used to zoom in and out and to move in the maps.
The UCAC2 catalog is now taken into account.
A bug has been fixed in the computation of comet magnitudes. This could potentially stop the program execution.
An option has been added to keep the telescope hand controller in the front of other windows.

C2A includes a tool to analyze and plot tracking drifts for telescope mountings. In its current version, C2A is able to read data files produced by the Iris software.

This version does not use anymore the calendar control Mscal.ocx which is at the origin of many problems when used with different versions of Windows.

LX200 compatible telecope control.
Tool to plan observations.
Minor bug fixes.

Installation package is now available in English.
Compiled databases can be loaded in C2A
A new tab has been added in the object information window in order to help in the setup of a telescope circles.
A problem has been fixed in the input of the date.
Moon phases are displayed when the moon icon is clicked in the dialog zone with the mouse right button.
It is now possible to associate file extension to C2A drom the Tools menu (files CCF, FITS andPIC).
Possibility to specify 2 lines of text in the printing.
A command "Copy" has been added to the menu "Edition" in order to copy an image of the current map into the clipboard.

Images from the STScI DSS server can be accessed from C2A.
Background images are better managed and their display takes into account rotation and symetry of the field.
Sky background can be filled outside the limits of a given constellation.
User catalogs can now be loaded (syntax is define in the Help system)
Jupiter satellites are now displayed.
Field value can now be quicly defined in the secondary tool bar.
Field rotation angles can now be quickly defined in the secondary tool bar.
Fonts can now be customized (in the Options / Misc tab).
Planet images are now displayed at high zoom levels. Symetries and field rotation are taken into account to display images.
Help system is only available in French.
Installation procedure is in French but easy to understand.

A new tool is available to display planetary positions at 3 dates in the month. This is a useful tool to see at a glance what are going to be the observing conditions.
A new tool bar is available to apply directly some pre-defined zoom values.
Local time is better taken into account throughout the software in order to facilitate its usage.
A display problem under Windows XP has been fixed.
New locations have been added to the list of pre-defined observing locations.
A new version of the help system is provided, but it is still in French...

The image processing window is now able to handle BMP, GIF, FITS and PIC files. Once displayed, images can be applied to the field background.
It is now possible to apply several images in different field backgrounds and to manage background images through a dedicated window.
A new tool has been added to display Moon phases for a given month.
A new version of the help system is provided, but it is still in French...

C2A is now able to acquire through Internet and display images from the ESO DSS survey.
A tool to browse BT-Atlas has been added.
It is now possible possible to specify the number of steps between two date labels on Solar System objects trajectories (Sun, Moon, planets, asteroids and comets). This option is available in the Options dialog box, "SolSys" tab

Support of the catalogue UCAC1 (see the site http://ad.usno.navy.mil/ucac/ for more information). Prior to be used, this catalogue must be compiled using the appropriate utility available from the page Tools on this site.