The nautical almanac 2025. NP314-25. His Majesty's notical almanac office

Издание на английском языке
The almanac is an important reference book that includes astronomical data necessary for navigation at sea. It was created to provide sailors, both British and American, with accurate information about the position of celestial bodies, which is crucial for safe and efficient navigation. The main sections of the almanac contain information about the sunrise and sunset of the Sun and Moon, as well as the length of daylight and dusk, which is especially important for ships operating in high latitudes, where light conditions can vary significantly. The almanac also features a section on Polar phenomena, which includes graphs and explanations to help sailors calculate sunrise and sunset times, as well as the duration of civil twilight.

Contents
Title page, preface, etc.
Phases of the Moon
Calendars
Eclipses
Planet notes and diagram
Daily pages: Ephemerides of Sun, Moon, Aries and planets; sunrise, sunset, twilights, moonrise, moonset, etc.
Explanation
Standard times
Star charts
Stars: SHA and Dec of 173 stars, in order of SHA (accuracy 011)
Polaris (Pole Star) tables
Sight reduction procedures; direct computation
Concise sight reduction tables
Form for use with concise sight reduction tables
Polar Phenomena
Semi-duration of sunlight and twilight
Semi-duration of moonlight
Conversion of arc to time
Tables of increments and corrections for Sun, planets, Aries, Moon
Tables for interpolating sunrise, sunset, twilights, moonrise, moonset, Moon’s meridian passage
Index to selected stars
Altitude correction tables for the Moon
Auxiliary pages, preceding page 1
Altitude correction tables for Sun, stars, planets
Additional refraction corrections for non-standard conditions