Information sources
Where the place names, time-zone rules, Sun and Moon times, and forecasts come from.
Updated: 10 August 2026
GeoNames
GeoNames supplies city and country names, coordinates, population, administrative areas and time-zone identifiers.
IANA Time Zone Database
The IANA Time Zone Database supplies the rules used to calculate UTC offsets and clock changes for named time zones.
Unicode CLDR
Unicode CLDR supplies consistent English names for countries, currencies and languages.
US Naval Observatory
The US Naval Observatory supplies daily Sun and Moon times when information is available for the requested date.
Visit USNO Astronomical Applications
WeatherAPI.com
WeatherAPI.com supplies current conditions, hourly forecasts and three-day forecasts.