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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Astronomy Reports</journal-id><journal-title-group><journal-title xml:lang="en">Astronomy Reports</journal-title><trans-title-group xml:lang="ru"><trans-title>Астрономический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0004-6299</issn><issn publication-format="electronic">3034-5170</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">688843</article-id><article-id pub-id-type="doi">10.31857/S0004629925050061</article-id><article-id pub-id-type="edn">PSCFHS</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">EFFICIENT COMPUTATIONS IN KEPLERIAN MOTION AND KEPLER'S EQUATION</article-title><trans-title-group xml:lang="ru"><trans-title>ЭФФЕКТИВНЫЕ ВЫЧИСЛЕНИЯ В КЕПЛЕРОВСКОМ ДВИЖЕНИИ И УРАВНЕНИИ КЕПЛЕРА</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Moiseev</surname><given-names>I. A.</given-names></name><name xml:lang="ru"><surname>Моисеев</surname><given-names>Ю. А.</given-names></name></name-alternatives><email>moiseev.ia20@physics.msu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Emelyanov</surname><given-names>N. V.</given-names></name><name xml:lang="ru"><surname>Емельянов</surname><given-names>Н. В.</given-names></name></name-alternatives><email>emelia@sai.msu.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University, Faculty of Physics, Department of Celestial Mechanics, Astrometry and Gravimetry</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М. В. Ломоносова, физический факультет, кафедра небесной механики, астрометрии и гравиметрии</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Lomonosov Moscow State University, Sternberg Astronomical Institute</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М. В. Ломоносова, Государственный астрономический институт им. П. К. Штернберга</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-05-15" publication-format="electronic"><day>15</day><month>05</month><year>2025</year></pub-date><volume>102</volume><issue>5</issue><issue-title xml:lang="en">VOL 102, NO5 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 102, №5 (2025)</issue-title><fpage>420</fpage><lpage>434</lpage><history><date date-type="received" iso-8601-date="2025-08-08"><day>08</day><month>08</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, The Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">The Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0004-6299/article/view/688843">https://journals.eco-vector.com/0004-6299/article/view/688843</self-uri><abstract xml:lang="en"><p>The article considers the main aspects of practical calculations by the formulas of Keplerian motion. The initial value under consideration is the mean anomaly and five other constant parameters. Much attention is paid to solving the Kepler equation. An overview of the methods for solving is given. A method for specifying the accuracy of calculations is considered, taking into account the limited accuracy of representing numbers in a computer system. The article provides examples of solving the Kepler equation and examples of motion trajectories. According to the considered concept, an optimal program for calculations is compiled in the programming languages C/C++, Fortran, Python and offered on the Internet pages. The user is given the opportunity to choose a method for solving the Kepler equation from those considered in the article.</p></abstract><trans-abstract xml:lang="ru"><p>В статье рассмотрены основные аспекты практических вычислений по формулам кеплеровского движения. Рассматриваемой исходной величиной является средняя аномалия и пять других постоянных параметров. Большое внимание уделено решению уравнения Кеплера. Дан обзор методов его решения. Рассмотрен способ задания точности вычислений, учитывающий ограниченную точность представления чисел в компьютерной системе. В статье приведены примеры решения уравнения Кеплера и примеры траекторий движения. Согласно рассмотренной концепции составлена на языках программирования C/C++, Fortran, Python и предложена на страницах интернета оптимальная программа для вычислений. Пользователю предоставляется возможность выбора метода решения уравнения Кеплера из рассмотренных в статье.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Keplerian motion</kwd><kwd>Kepler's equation</kwd><kwd>computer modeling</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>кеплеровская орбита</kwd><kwd>уравнение Кеплера</kwd><kwd>численное моделирование</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>D.A. 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