Complete Sun and Moon Data for One Day

This data service provides rise, set, and transit times for the Sun and Moon, civil twilight beginning and end times , and lunar phase information for any year between 1700 and 2100. First, specify the date and location in the fields below. Then, click the "Get Data" button at the end of the form.

Use the buttons under Location to find coordinates of cities or towns in the U.S. or its territories, or to convert between Degrees-Minutes-Seconds (DMS) and Decimal Degrees.

Be sure to read the Notes, especially if you wish to use these data for legal purposes.

US Location For example: Washington, DC

City

State or Territory

The place name you enter above must be a city or town in the U.S. The place's location will be retrieved from a list of over 22,000 places. Either upper- or lower-case letters or a combination can be used. Spell out place name prefixes, as in "East Orange", "Fort Lauderdale", "Mount Vernon", etc. The only exception is "St.", which is entered as an abbreviation with a period, as in "St. Louis". You need only enter as many characters as will unambiguously identify the place.

Date Format: YYYY-MM-DD

Location Coordinates in decimal degrees, North and East are positive. For example: 38.9072, -77.0369

Latitude

Longitude

Location Label Custom label for printed output. For example: Washington, DC

Need coordinates? Try NGA's GEOnet Names Server (GNS)
Need U.S. coordinates? Try the USGS Geographic Names Information System (GNIS) .

Time Zone Example: 5 hours West of Greenwich (UTC-5) is Eastern Standard Time

hours

direction

East of Greenwich (UTC)

West of Greenwich (UTC)

Need a time zone? Try the time zone map.

Account for US Daylight Saving Time? No Yes

Notes

Legal Use of the Calculated Data

Please see Astronomical Data Used for Litigation if you are interested in using the data produced by this service for legal purposes.

Definitions

For more information on the terms used, see the Astronomical Almanac Glossary , or the Rise, Set, Transit, and Twilight Definitions, and the Phases of the Moon and Percent of the Moon Illuminated pages in the Astronomical Information Center.

Computing Data for Multiple Days

If you need rise, set, or twilight times for a series of dates for a specific location, use our

Sun or Moon Rise/Set Table for One Year service, which computes a one-page table covering a calendar year
Rise/Set/Transit Times for Major Solar System Bodies and Bright Stars service, which computes Sun/Moon/planet/star phenomena for a given number of days

Lunar Information

The moon phase and fraction illuminated provided are computed for noon on the date requested, in the time zone requested.

Time Formats

All the output times will be on a 24-hour clock.

Time Zones

When using the "Need USA Location" button, the service will fill the Time Zone hours field and set the Time Zone direction button according to the current standard time zone of the US place entered.

The railroads introduced standardized time zones to the USA in 1883. Since then, time zone boundaries have evolved considerably, with many cities and counties shifting from one zone to another. This service makes no attempt to track such historical changes.

For locations that require it, you may enter the time zone in decimal hours. For example, for locations in India, you may enter 5.5 hours east of Greenwich for the time zone. The time zone field can accommodate up to five characters.

Daylight Saving Time

This service implements US daylight saving time (DST) rules for dates from 1967 through the present day in accordance with the Uniform Time Act of 1966 and subsequent legislation. If you set the "Account for US Daylight Saving Time" radio button on, the results will include a 1 hour offset to the given Time Zone hour if the requested date occurs during a DST period.

This service does not evaluate whether a location associated with manually entered coordinates observes DST. When using the "Need a USA Location" button, the service will set the "Account for US Daylight Saving Time" radio button according to the current practice in that location. For instance, most locations in Arizona do not observe Daylight Saving Time, and therefore the "No" radio button will be automatically selected.

Application Programming Interface

This data service uses one of our Application Programming Interfaces (APIs). The API returns data in JavaScript Object Notation (JSON) format for users who wish to manipulate data into a customized format. For more information on the API, please see the documentation page.

Sunset photo by Lu Rarogiewicz from Mt. Wilson, California.