NWS Jacksonville, FL Astronomical Data

Coastal Flood Warnings & Advisories for the St. Johns River Basin & Atlantic Coast

Persistent onshore winds will combine with high astronomical tides to create minor to moderate flooding around times of high tide for the St. Johns River basin, where a Coastal Flood Warning is in effect from downtown Jacksonville southward to Lake George through Thursday afternoon. Coastal Flood Advisories remain in effect for the Atlantic coast and Intracoastal Waterway through Saturday. Read More >

SUNRISE AND SUNSET INFORMATION

Astronomical Data

Sun and Moon

NOAA Solar Calculator - Find Sunrise, Sunset, Solar Noon and Solar Position for any location.
NOTE: The USNO websites aa.usno.navy.mil, ad.usno.navy.mil, aristarchus.usno.navy.mil, maia.usno.navy.mil, rorf.usno.navy.mil, and toshi.usno.navy.mil are undergoing modernization efforts. The expected completion of the work and return of service is estimated as 30 April 2020.
USNO - Sunrise/Sunset & Moonrise/Moonset Calculator for one day, anywhere in the U.S.
USNO - Sunrise/Sunset & Moonrise/Moonset Tables for one year, anywhere in the U.S.
USNO - Phases of the Moon
Perigee and Apogee Calculator

Tides and Currents

Time

Official U.S. Time

The U.S. Naval Observatory (USNO) computes astronomical data. Therefore, the NWS does not record, certify, or authenticate astronomical data. Computed times of sunrise, sunset, moonrise, moonset; and twilight, moon phases and other astronomical data are available from USNO's Astronomical Applications Department (http://www.usno.navy.mil).

The USNO websites aa.usno.navy.mil, ad.usno.navy.mil, aristarchus.usno.navy.mil, maia.usno.navy.mil, rorf.usno.navy.mil, and toshi.usno.navy.mil are undergoing modernization efforts. The expected completion of the work and return of service is estimated as 30 April 2020.
See U.S. Naval Observatory - FAQ - Litigation for information on using these data for legal purposes.