Nautical Astronomical Yearbook for 2025

DOI: 10.32876/NavalYearbook.2025

Preface

The basis of the "Nautical Astronomical Yearbook" (NAY, in Russian) is the daily visible geocentrical equatorial ephemerides of bright navigational stars - the Sun, Moon, four major planets (Venus, Mars, Jupiter, Saturn) and 69 brightest stars, as well as the time of the rising and setting of the Sun and Moon, the time of the beginning and end of civil and navigational twilights, the azimuths of the upper limb of the Sun at sunrise and sunset. These ephemerides, as well as monthly ephemeris of the 160 stars and the tables of Polaris, together the interpolation tables, the modified table of altitudes and azimuths of stars TAA-57, and a number of auxiliary tables allow to solve the main navigational tasks using the methods of classical nautical astronomy without involving additional manuals.

According to the resolutions of XXIV-XXVI General Assemblies of International Astronomical Union (2000-2006) and the All-Russia conference В«Fundamental both applied coordinate-time and navigation supportВ» (KVNO-2007) the calculation of ephemerides is based on the modern theories representing the motion of celestial bodies with an accuracy sufficient for analitical researches and practical applications.

In NAY, when calculating the positions of the Sun, the Moon, and major planets, the domestic numerical theory of EPM2011m was used. The positions of the stars are published in the system of star catalogues FK6 and HIPPARCOS.

NAY is published with modifications advised by the meeting of the representatives of DNO MDRF, SRNHI MDRF, M.V. Frunze HNA, S.O.Makarov SMA, VSOK Navy and IAA RAS (1999) in St.-Petersburg and confirmed by the resolution of the All-Russian Astronomical Conference (VAK-2001, St.-Petersburg).

Responsible for calculating ephemeris data for NAY for 2025 are the following researchers of the laboratory of astronomical yearbooks of the IAA RAS:

• hour angles of the first point of Aries, coordinates of the Sun, Moon, and planets, the times of culminations, parallaxes, visible semi-diameters and phases of the Moon, configurations of the planets, the beginnings of seasons - N.I. Glebova;

• conditions of visibility of the planets, apparent places of stars, celestial maps, tables of Polaris - G.A. Kosmodamianskiy;

• the time of rising and setting of the Sun and the Moon, azimuths of the upper limb of the Sun for the time of sunrise and setting, the time of the beginning and ending of civil and navigational tvilights, eclipses of the Sun and the Moon

• M.V. Lukashova.

The explanation for NAY 2025 revized by V.N. Kostin, M.V. Lukashova. Examples calculated by M.V. Lukashova.

M.V. Lukashova have made the original layout of the Explanation. Editing version of the tables part of the MAE using the system of making-up of tabulated editions SVITA has been made by D.A. Ryzhkova.

The proof-reading of the material was carried out by I.A. Lebedeva, A.M. Yurchenko.

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