APA

United States Naval Observatory, .The astronomical almanac online. Washington, D.C: U.S. Nautical Almanac Office in the United States (USNO).

Chicago

United States Naval Observatory, .The astronomical almanac online. Washington, D.C: U.S. Nautical Almanac Office in the United States (USNO).

Harvard

United States Naval Observatory, .The astronomical almanac online. Washington, D.C: U.S. Nautical Almanac Office in the United States (USNO).

MLA

United States Naval Observatory, .Washington, D.C: U.S. Nautical Almanac Office in the United States (USNO). .