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来自「球面天文学（岁差、章动）和天体力学（行星星历表）的原始计算公式、算法和程序。ma」· M 代码 · 共 10 行

DTR = 1.7453292519943295769e-2;
RTD = 5.7295779513082320877e1;
RTS = 2.0626480624709635516e5;	%arc seconds per radian 
STR = 4.8481368110953599359e-6;	%radians per arc second 

J2000 = 2451545.0;	% 2000 January 1.5 
B1950 = 2433282.423;	% 1950 January 0.923 Besselian epoch 
J1900 = 2415020.0;	% 1900 January 0, 12h UT