There are three sources for natal charts data in Horizons:

  1. Manual input
  2. Sirius work charts list
  3. Sirius database

You may get access to all three methods by selecting File->Enter new chart main menu item

In this window you may manually type in the chart data or select a chart from Sirius charts list or from Sirius database.

When selection is complete, click OK button, the main screen re-draws and you a selected chart name in program window caption.

This is a Sirius charts list window

This is a Sirius DB selection button window

This is a Sirius DB chart selection window