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The USNO websites aa.usno.navy.mil, ad.usno.navy.mil, aristarchus.usno.navy.mil, maia.usno.navy.mil, rorf.usno.navy.mil, toshi.usno.navy.mil, and tycho.usno.navy.mil are undergoing modernization efforts. The expected completion of the work and the estimated return of service is Fall 2020, subject to change due to potential impacts of COVID-19.
 

Privacy Advisory

We will not obtain personally identifying information about you when you visit our site unless you choose to provide such information to us. If you choose to send email to the site webmaster or submit an online feedback form, any contact information that you provide will be used solely to respond to your request.