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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">izmertech</journal-id><journal-title-group><journal-title xml:lang="ru">Измерительная техника</journal-title><trans-title-group xml:lang="en"><trans-title>Izmeritel`naya Tekhnika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-1025</issn><issn pub-type="epub">2949-5237</issn><publisher><publisher-name>ФГУП "ВНИИФТРИ"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32446/0368-1025it.2020-10-26-32</article-id><article-id custom-type="elpub" pub-id-type="custom">izmertech-1845</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФУНДАМЕНТАЛЬНЫЕ ПРОБЛЕМЫ МЕТРОЛОГИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>FUNDAMENTAL PROBLEMS OF METROLOGY</subject></subj-group></article-categories><title-group><article-title>Размерности плоского и телесного углов и их единицы в Международной системе единиц</article-title><trans-title-group xml:lang="en"><trans-title>Dimensions of plane and solid angles and their units in the International System of Units (SI)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Калинин</surname><given-names>М. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalinin</surname><given-names>M. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Mikhail I. Kalinin</p><p>Moscow</p></bio><email xlink:type="simple">kalinin@vniims.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Исаев</surname><given-names>Л. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Lev K. Isaev</surname><given-names>L. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Lev K. Isaev</p><p>Moscow</p></bio><email xlink:type="simple">isaev-vm@vniims.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Булыгин</surname><given-names>Ф. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Bulygin</surname><given-names>F. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Fedor V. Bulygin</p><p>Moscow</p></bio><email xlink:type="simple">fbulygin@vniims.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Всероссийский научно-исследовательский институт метрологической службы</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian Research Institute for Metrological Service (VNIIMS)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>18</day><month>07</month><year>2023</year></pub-date><volume>0</volume><issue>10</issue><fpage>26</fpage><lpage>32</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; ФГУП "ВНИИФТРИ", 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">ФГУП "ВНИИФТРИ"</copyright-holder><copyright-holder xml:lang="en">ФГУП "ВНИИФТРИ"</copyright-holder><license xlink:href="https://www.izmt.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.izmt.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.izmt.ru/jour/article/view/1845">https://www.izmt.ru/jour/article/view/1845</self-uri><abstract><p>Проанализирована ситуация, сложившаяся в Международной системе единиц (СИ) в результате принятия в 1980 г. рекомендации Международного комитета мер и весов, предложившей рассматривать плоский и телесный углы как безразмерные производные величины. Показано, что основанием для такого решения стало неправильное понимание математической формулы, связывающей длину дуги окружности с её радиусом и соответствующим центральным углом, а также разложений тригонометрических функций в ряды. Из проведённого анализа следует, что величина плоский угол не зависит ни от одной величины СИ и должна быть отнесена к основным величинам, а её единицу – радиан – необходимо включить в совокупность основных единиц СИ. Величина телесный угол при этом оказывается производной величиной от плоского угла, его единица – стерадиан – является когерентной производной единицей, равной радиану в квадрате.</p></abstract><trans-abstract xml:lang="en"><p>The situation that has developed in the International System of Units (SI) as a result of adopting the recommendation of the International Committee of Weights and Measures (CIPM) in 1980, which proposed to consider plane and solid angles as dimensionless derived quantities, is analyzed. It is shown that the basis for such a solution was a misunderstanding of the mathematical formula relating the arc length of a circle with its radius and corresponding central angle, as well as of the expansions of trigonometric functions in series. From the analysis presented in the article, it follows that a plane angle does not depend on any of the SI quantities and should be assigned to the base quantities, and its unit, the radian, should be added to the base SI units. A solid angle, in this case, turns out to be a derived quantity of a plane angle. Its unit, the steradian, is a coherent derived unit equal to the square radian.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>основные величины</kwd><kwd>производные величины</kwd><kwd>плоский угол</kwd><kwd>телесный угол</kwd><kwd>основные единицы</kwd><kwd>производные единицы</kwd><kwd>радиан</kwd><kwd>стерадиан.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>base quantities</kwd><kwd>derived quantities</kwd><kwd>plane angle</kwd><kwd>solid angle</kwd><kwd>base units</kwd><kwd>derived units</kwd><kwd>radian</kwd><kwd>steradian.</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">CIPM, 1969, 58 Session: Reco mmandation 1, p. 30, available at: https://www.bipm.org/en/CIPM/db/1969/1/(accessed:31.08.2020).</mixed-citation><mixed-citation xml:lang="en">. 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