We use some essential cookies to make this website work.
We’d like to set additional cookies to understand how you use 51²è¹Ý, remember your settings and improve government services.
We also use cookies set by other sites to help us deliver content from their services.
You have accepted additional cookies. You can change your cookie settings at any time.
You have rejected additional cookies. You can change your cookie settings at any time.
Departments, agencies and public bodies
News stories, speeches, letters and notices
Detailed guidance, regulations and rules
Reports, analysis and official statistics
Consultations and strategy
Data, Freedom of Information releases and corporate reports
The home of HM Nautical Almanac Office on 51²è¹Ý. HM Nautical Almanac Office is a small multi-disciplinary group of specialists whose purpose is to provide solutions to astronomical and celestial navigation problems.
HM Nautical Almanac Office provides the daily rise, set and twilight times in May for the United Kingdom and Ireland.
The visibility of the new crescent moon for late May 2025.
HM Nautical Almanac Office is a small multi-disciplinary group of specialists whose purpose is to provide solutions to astronomical and celestial navigation problems.
The visibility of the new crescent moon for late March 2025.
The visibility of the new crescent moon for late February and early March 2025.
NavPac 4 is the much anticipated software upgrade to HMNAO’s celestial navigation software package
HM Nautical Almanac Office provides the daily rise, set and twilight times in September for the British Isles.
HM Nautical Almanac Office provides the daily rise, set and twilight times in April for the United Kingdom and Ireland.
HM Nautical Almanac Office provides the daily rise, set and twilight times in February for the British Isles
Don’t include personal or financial information like your National Insurance number or credit card details.
To help us improve 51²è¹Ý, we’d like to know more about your visit today. .