Some cities are 10 miles or more in diameter. If a person is born on the east edge versus west edge of the city, there can be a difference in the house cusps of 10 or 15 minutes and in some cases even more. To obtain more accurate charts, you can now select the hospital where a person is born in many places in the USA (hospitals in other countries are not available).
When entering the name of a place in the data entry screen, a list of hospitals in the place being entered are displayed and you can select a hospital as the birth place. For example, if you enter "Los Angeles, c", then "Los Angeles, California" is displayed as the place and hospitals like "Edgemont Hospital" and it is noted on the screen that Edgemont Hospital is in Los Feliz (a part of Los Angeles) and "Good Samaritan Hospital in Los Angeles. There are also health centers and hospitals shown where a person is not likely to be born. You can select an area for hospitals to be listed. Each minute of arc is very roughly equivalent to one mile so a setting of 5' of latitude and longitude displays hospitals very roughly within 5 miles of the coordinates used for Los Angeles. To see hospitals in a greater area simply select one of the selections for a greater area. You can also select "Match place entered" to type in the name of a hospital rather than display hospitals near the town or city that you are entering. If you select a hospital where a person is born, then the latitude and longitude of the hospital are used to calculate the chart and this results in more accurate chart calculations than if you select the city. Currently only hospitals in the United States are available. If we are able to obtain suitable databases of hospitals in other countries, these can be used to make available hospitals in other countries in future versions of Sirius.