(O-C)-Generator for the Lichtenknecker-Database of the BAV

The Lichtenkecker-Database of the BAV (LkDB) is the collection of 189237 minima of 2251 eclipsing binaries. With the exception of some stars, they all are in normal light brighter than mag 13 and have a declination δ >= -20°.

Detailed information about the LkDB, the history of the LkDB as well to Dieter Lichtenknecker can be found in the documentation.

This is revision 5.0 of the LkDB with a completely revised (O-C)-Generator.

Quick overview about the changes and novelties.

Through the menu-entry "Statistical interpretation" the stored minima can be evaluated according to several criteria (For more information see there).

Name of the variable (e.g. RT And): Quick help for usage
The choices for the range of date and the method of observation can be found on the page of the (O-C)-diagram.

Last revision: 20.2.2019 (Rev R506)
Quick help for the usage of the O-C-Generator of the LkDB
Input options:   1st: A constellation acronym (3 Characters)    2nd: The name of a variable
1st: Constellation acronym: Display of a table of the variables contained in the LkDB for this constellation.
  A variable can be selected by a click on the name.
  If the entered constellation is wrong or there are no variables from it in the LkDB a table of the constellations with stars in the LkDB is shown. A click on an acronym leeds to the table of variables of the constellation.
2nd: Name of variable: The input of constellation and name will be checked individually.
  If the constellation is not in the LkDB it is proceeded like entering a unknown constellation (s.a). If the star is unknown, the table of the stars contained in the LkDB for the selected constellation is shown.
Both methods of input may be finished with the "ENTER"-key.
With the button Select a constellation the table of constellations is shown directly.
With Generate (O-C)-Diagramm the input is checked and, depending on the result, proceeded in the way described before.
More information can be found in the documentation in chapter 3 "The (O-C)-Generator".
Overview about the changes and novelties
1. In the starting menu the look and the arrangement of the buttons is revised.
2. The page with the results of the (O-C-)-generator is split into two parts:
  a. The area with the information about the star like coordinates, type, the number of times of minima as well as the possibilities for selection of elements, obervational methods, period of time and the entry of own times of minima.
  b. The (O-C)-diagram. This area is shown first. The complete screen is used. Therefore it is recommended to maximize the window. To see the information about the star, you have to scroll upward.
3. The calculation of the (O-C)-values is done with a new method. So the (O-C)-values may become larger than one period, but jumps of the (O-C)-curve shouldn't happen.
4. Times of minima resulting from weak images on a photo plate are shown with a symbol of its own.
5. Inside of the diagram, the cursor is shown as crosshairs.
6. When the cursor is positioned on the symbol of a time of minimum, the associated information like date, (O-C)-value, method of observation and observer are shown at once.
7. The starting epoch E0 is marked in the diagram.
8. Details to the changes can be found in chapter 3 "The (O-C)-Generator".of the totally revised documentation.