Description

Navigational Astronomical Helper software is designed to calculate the equatorial and horizontal coordinates of navigational stars. These parameters are required for solving problems of Nautical Astronomy. This program can partially replace the Nautical Astronomical Yearbook (NAY, in Russia) or its analogues for the navigator (see, for example, [1] and [2]). The graphical user interface in Russian is shown in the screenshot.

The program implements the calculation of parameters for 160 stars presented in the NAY. The table with a list of stars indicates for each star: NAY number, Bayer letter and component number (if the star is double, triple, etc.), the name of the constellation and the proper name of the star (if there is). The initial data for calculating the parameters are: universal (Greenwich) time $T_{гр}$, date and coordinates of the observer’s position. For a more detailed study of the issue, one can start with [3] and [4]. See also [5] and [6].

Calculated parameters

The program allows you to calculate the following parameters:

• $\alpha$ is right ascension of the star,
• $\tau^{*}$ is sidereal hour angle,
• $t_{гр}$ is Greenwich hour angle,
• $\delta$ is declination of the star,
• $t_{м}$​is local hour angle,
• $m$ is magnitude,
• $t_{гр}^{ɤ}$ is Greenwich hour angle of the first point of Aries (Aries),
• $t_{м}^{ɤ}$​is local hour angle of the first point of Aries,
• $h$ is altitude of the celestial body above the horizon (Alt),
• $A$ is azimuth of the star (Az).

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Literature

[1] Морской астрономический альманах на 2013–2014 гг. СПб.: Наука, 2012. 392 c.

[2] Brown’s Nautical Almanac 2016. Glasgow: Brown, Son & Ferguson, 2016. 625 p.

[3] Хлюстин Б. П. Мореходная астрономия. В 2 ч. Часть 1: учебное пособие для вузов. М.: Издательство Юрайт, 2018. 267 с.

[4] Хлюстин Б. П. Мореходная астрономия. В 2 ч. Часть 2: учебное пособие для вузов. М.: Издательство Юрайт, 2018. 234 с.

[5] Алцыбеев Г. О. Математические методы получения астронавигационных параметров // Современное развитие России через призму научных исследований. 2018. С. 30–34.

[6] Козик С. В., Денисова А. А., Алцыбеев Г. О. Математическая модель движения навигационных светил на небесной сфере // Вестник Государственного университета морского и речного флота имени адмирала С. О. Макарова. 2020. № 12. С. 35–45.