Welcome to Astrology Chart Generator.http://astro-chart.appspot.comThis application is work in progress and may therefore still display incorrect results. The ephemeris used in this application can be found at:http://www.findyourfate.com/astrology/ephemeris/ephemeris.html Astrology Chart Generator uses the following IP-location lookup service:http://freegeoip.net The location lookup by city-name is powered by:http://code.google.com/apis/maps/index.html Sunrise and sunset calculations are done according to the formulas provided at:http://users.electromagnetic.net/bu/astro/sunrise-set.phpThis application will therefore calculate the same results for sunrise and sunset as calculated here:http://users.electromagnetic.net/bu/astro/iyf-calc.php(Beware: There are many other online calculators that result in different results.)