The U.S. government is closed. This site will not be updated; however, NOAA websites and social media channels necessary to protect lives and property will be maintained.

To learn more, visit commerce.gov.

For the latest forecasts and critical weather information, visit weather.gov.

Solar Calculator Links

Please note: inclusion in this list does not imply any endorsement by NOAA or the Department of Commerce. Links are provided with no guarantee of data quality or accuracy. When you click on any of the links below, you will be leaving the NOAA site. You may wish to review the privacy notices on these external sites, as their information collection practices may differ from NOAA's. If you have any trouble with information obtained from any of these links, please contact their respective webmasters.

Calculations: Daylight Saving Time: Education: Latitude and Longitude: Time and Timekeeping:

Solar Calculation Resources: