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    "description": "A concept of dynamical equinox and its relation to the analytical form of the adopted theory of the Sun is discussed. Connection between the FK4 equinox and the dynamical equinox is determined by comparing two analytical theories of the Sun (the adopted Newcomb\u2019s theory and a new one (AT-1) constructed at the Instituted of Theoretical Astronomy) with solar meridian observations made at US Naval Observatory (1911\u20131971 yr.). Corrections \u0394\u03b1 to the FK4 right ascensions, \u0394\u03b4O to declinations and \u0394\u03b5 to the angle between the equator and the ecliptic are:\n\\documentclass[12pt]{minimal}\n\t\t\t\t\\usepackage{amsmath}\n\t\t\t\t\\usepackage{wasysym}\n\t\t\t\t\\usepackage{amsfonts}\n\t\t\t\t\\usepackage{amssymb}\n\t\t\t\t\\usepackage{amsbsy}\n\t\t\t\t\\usepackage{mathrsfs}\n\t\t\t\t\\usepackage{upgreek}\n\t\t\t\t\\setlength{\\oddsidemargin}{-69pt}\n\t\t\t\t\\begin{document}$$\nA\\alpha  = \\begin{array}{*{20}{c}}\n{{0^s}.024 \\pm {0^s}.003 - \\left( {{0^s}.003 \\pm {0^s}.023} \\right)*\\left( {T - 19.40} \\right){\\text{ Newcomb}}} \\\\\n{{0^s}.032 \\pm {0^s}.003 - \\left( {{0^s}.0012 \\pm {0^s}.022} \\right)*\\left( {T - 19.40} \\right){\\text{     AT - 1  }}}\n\\end{array}\n$$\\end{document}\\documentclass[12pt]{minimal}\n\t\t\t\t\\usepackage{amsmath}\n\t\t\t\t\\usepackage{wasysym}\n\t\t\t\t\\usepackage{amsfonts}\n\t\t\t\t\\usepackage{amssymb}\n\t\t\t\t\\usepackage{amsbsy}\n\t\t\t\t\\usepackage{mathrsfs}\n\t\t\t\t\\usepackage{upgreek}\n\t\t\t\t\\setlength{\\oddsidemargin}{-69pt}\n\t\t\t\t\\begin{document}$$ \\begin{gathered} \\Delta {{\\delta }_{0}} = 0_{.}^{}25\\pm 0_{.}^{}02 + (0_{.}^{}67\\pm 0_{.}^{}07)*(T - 19.40)\\quad Newcomb \\hfill \\\\ \\quad \\quad \\;\\;0_{.}^{}25\\pm 0_{.}^{}02 + (0_{.}^{}67\\pm 0_{.}^{}07)*(T - 19.40)\\quad AT - 1 \\hfill \\\\ \\end{gathered}  \n$$\\end{document}\\documentclass[12pt]{minimal}\n\t\t\t\t\\usepackage{amsmath}\n\t\t\t\t\\usepackage{wasysym}\n\t\t\t\t\\usepackage{amsfonts}\n\t\t\t\t\\usepackage{amssymb}\n\t\t\t\t\\usepackage{amsbsy}\n\t\t\t\t\\usepackage{mathrsfs}\n\t\t\t\t\\usepackage{upgreek}\n\t\t\t\t\\setlength{\\oddsidemargin}{-69pt}\n\t\t\t\t\\begin{document}$$ \\begin{gathered} \\Delta \\varepsilon  = 0_{.}^{}26\\pm 0_{.}^{}01 + (0_{.}^{}12\\pm 0_{.}^{}09)*(T - 19.40)\\quad Newcomb \\hfill \\\\ \\quad \\quad {\\kern 1pt} 0_{.}^{}30\\pm 0_{.}^{}01 + ({\\kern 1pt} 0_{.}^{}17\\pm 0_{.}^{}08)*(T - 19.40)\\quad AT - 1 \\hfill \\\\ \\end{gathered}  $$\\end{document}Secular variations in \u0394\u03b1 and \u0394\u03b5 may be explained by improvement of observational conditions after reconstruction of the telescope pavilion in the forties.", 
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