Astronomical Applications Department. The Equation of Time. United States Naval Observatory. United States Navy. [1 August 2022]. (原始内容存档于2024-07-19).
Astronomical Applications Department. Astronomical Almanac Glossary. United States Naval Observatory. United States Navy. [1 August 2022]. (原始内容存档于2023-09-08).
Astronomical Applications Department. Astronomical Almanac Glossary. United States Naval Observatory. United States Navy. [1 August 2022]. (原始内容存档于2023-09-08).
Astronomical Applications Department. Astronomical Almanac Glossary. United States Naval Observatory. United States Navy. [1 August 2022]. (原始内容存档于2023-09-08).
Astronomical Applications Department. The Equation of Time. United States Naval Observatory. United States Navy. [1 August 2022]. (原始内容存档于2024-07-19).
Astronomical Applications Department. Astronomical Almanac Glossary. United States Naval Observatory. United States Navy. [1 August 2022]. (原始内容存档于2023-09-08).
Astronomical Applications Department. Astronomical Almanac Glossary. United States Naval Observatory. United States Navy. [1 August 2022]. (原始内容存档于2023-09-08).
Astronomical Applications Department. Astronomical Almanac Glossary. United States Naval Observatory. United States Navy. [1 August 2022]. (原始内容存档于2023-09-08).