The Air Almanac
The Air Almanac contains the astronomical data required for air
celestial navigation. The book provides the following data tabulated at
10-minute intervals to a precision of 1 arcminute: the Greenwich hour angle and
declination of the Sun, Moon, and three navigational planets; the Greenwich hour
angle of Aries; rise and set times of the Moon for a range of latitudes; and
other data. Each edition also contains sky diagrams for each month; sunrise,
sunset, and twilight tables; and positions of the navigational stars. The
Air Almanac is available nine months in advance of its edition date.
Beginning with the 2008 edition, The Air Almanac is available only in PDF format. It is expected that those requiring a paper copy of certain pages will have access to a printer. Starting with the 2015 edition, users may download the entire almanac free of charge, although the CD is still available for purchase through the Government Publishing Office (GPO).
| Editions of The Air Almanac Available for Download | ||||
|---|---|---|---|---|
| Year | Title | Link | File Size | |
| 2025 | aira25_all.pdf | 25 MBytes | ||
| 2024 | aira24_all.pdf | 32 MBytes | ||
| 2023 | aira23_all.pdf | 34 MBytes | ||
Some links of interest for The Air Almanac:
- The Air Almanac Errata page contains information on errors in the publication.
- The history of The Air Almanac is found here.
- Ordering Information contains instructions on how to order The Air Almanac.
- The Depository Libraries around the United States retain a reference copy for each year of publication.