Admiralty The Nautical Almanac 2026. NP314-26. His Majesty's Nautical Almanac Office

Издание на английском языке
The Nautical Almanac is the official astronomical reference for maritime navigation, produced jointly by the British Hydrographic Office and the US Naval Observatory. This publication contains essential astronomical data for determining a vessel's position, calculating navigational parameters, and conducting observations at sea. It includes a section on polar phenomena with graphs of sunlight, twilight, and moonlight durations at high latitudes, allowing one to calculate the times of sunrise and sunset, moonrise, and moonset, as well as civil twilight. It is intended for mariners, navigators, and specialists in marine astronomy.

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 0T)
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
Bookmark Same as pages A2 and xxxiii