The Change Location tool allows one to change the birth location interactively: all charts and tables on the worksheet will instantly be recalculated according to the location on the map you click on. The curves drawn on the map show where each of the 12 signs was rising at the time of birth. When you move the mouse cursor over the map, the corresponding ascendant and ascending degree for that location is shown instantly above that map. In other words, you don’t need to click or change the birth chart to quickly find out what Ascendant was rising anywhere. Merely moving the mouse around will help you out.
Note that the same effect cannot so easily be achieved by editing the city in the birth data: that would require changing the timezone and daylight saving correction to the original values every time you change the coordinates).
Because this tool will update any chart or table you place on the worksheet, it is more powerful and versatile than it may seem. For example, you can use it in conjunction with the Shadbala graph to find out where on Earth a particular planet is the strongest. Or use it to locate a more auspicious Dasamsha chart (the divisional chart for profession) in your area.
You may also use it for the purpose of finding the most auspicious location to start the year. Since the moment of the exact solar return is fixed, your location at that time will determine the Ascendant of the solar return chart.