This "Chart Conversion" option is used only when you are saving charts into a Solar type chart file.

The default house system that is selected in this drop-down list is applied whenever the chart data that is being imported does not have a house system stored with it, or has a house system that is not recognized in Solar Fire.

If the Force all converted charts to use this house system option is checked, then all imported charts are given the default house system, regardless of what house system may be stored in the imported chart.

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