In astrology, latitude and longitude of a place is required to cast a birth chart. Without accurate coordinates of the place, it is not possible to get correct birth chart. Traditional way of finding latitude and longitude is looking up tables available in various books and ephemeris. Now a days there are also some online directory and latitude/ longitude database that can be used for finding latitude and longitude of a place. These are few of the websites which are very useful in finding correct latitude and longitude of a place -
(Shared by Shri KP Naidu on KP System Yahoo group.)
(Shared by Shri Sunaparantha on KP System Yahoo group)
Google Earth software is also useful software for finding precise longitude and latitude. It is freely available for download from Google, just search "Google Earth".