Computer Ephemeris for 2018 from DE200/LE200.

Longitude of central meridian of Neptune.

                                System 3
 Date    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
    1  168.0  231.6  126.8  191.5   81.0  147.6   38.4  105.9  173.0   63.0  128.3   16.3
    2  344.2   47.8  303.0    7.8  257.3  323.9  214.8  282.2  349.3  239.3  304.6  192.6
    3  160.5  224.1  119.3  184.1   73.6  140.3   31.2   98.6  165.7   55.6  120.8    8.8
    4  336.7   40.3  295.6    0.4  249.9  316.6  207.6  275.0  342.0  231.9  297.1  185.1
    5  153.0  216.6  111.9  176.7   66.3  133.0   23.9   91.3  158.4   48.2  113.4    1.3
    6  329.2   32.8  288.1  353.0  242.6  309.4  200.3  267.7  334.7  224.5  289.7  177.6
    7  145.4  209.1  104.4  169.4   58.9  125.7   16.7   84.1  151.0   40.9  105.9  353.8
    8  321.7   25.3  280.7  345.7  235.3  302.1  193.0  260.4  327.4  217.2  282.2  170.1
    9  137.9  201.6   96.9  162.0   51.6  118.4    9.4   76.8  143.7   33.5   98.5  346.3
   10  314.2   17.8  273.2  338.3  228.0  294.8  185.8  253.1  320.1  209.8  274.8  162.6
   11  130.4  194.1   89.5  154.6   44.3  111.2    2.1   69.5  136.4   26.1   91.0  338.8
   12  306.7   10.3  265.8  330.9  220.6  287.5  178.5  245.9  312.7  202.4  267.3  155.1
   13  122.9  186.6   82.1  147.2   37.0  103.9  354.9   62.2  129.1   18.7   83.6  331.3
   14  299.1    2.8  258.3  323.5  213.3  280.2  171.2  238.6  305.4  195.0  259.9  147.6
   15  115.4  179.1   74.6  139.8   29.7   96.6  347.6   55.0  121.7   11.3   76.1  323.8
   16  291.6  355.4  250.9  316.1  206.0  273.0  164.0  231.3  298.1  187.6  252.4  140.1
   17  107.9  171.6   67.2  132.4   22.3   89.3  340.4   47.7  114.4    3.9   68.7  316.3
   18  284.1  347.9  243.5  308.8  198.7  265.7  156.7  224.0  290.7  180.2  244.9  132.6
   19  100.4  164.1   59.7  125.1   15.0   82.1  333.1   40.4  107.1  356.5   61.2  308.8
   20  276.6  340.4  236.0  301.4  191.4  258.4  149.5  216.7  283.4  172.8  237.5  125.1
   21   92.8  156.7   52.3  117.7    7.7   74.8  325.8   33.1   99.7  349.1   53.7  301.3
   22  269.1  332.9  228.6  294.0  184.1  251.1  142.2  209.5  276.1  165.4  230.0  117.6
   23   85.3  149.2   44.9  110.4    0.4   67.5  318.6   25.8   92.4  341.7   46.3  293.8
   24  261.6  325.4  221.2  286.7  176.8  243.9  134.9  202.2  268.7  158.0  222.5  110.0
   25   77.8  141.7   37.5  103.0  353.1   60.2  311.3   18.5   85.0  334.3   38.8  286.3
   26  254.1  318.0  213.8  279.3  169.5  236.6  127.7  194.9  261.4  150.6  215.0  102.5
   27   70.3  134.2   30.1   95.6  345.8   53.0  304.0   11.2   77.7  326.8   31.3  278.8
   28  246.6  310.5  206.4  272.0  162.2  229.3  120.4  187.6  254.0  143.1  207.5   95.0
   29   62.8          22.7   88.3  338.5   45.7  296.8    3.9   70.3  319.4   23.8  271.3
   30  239.1         198.9  264.6  154.9  222.1  113.1  180.3  246.6  135.7  200.1   87.5
   31   55.3          15.2         331.2         289.5  356.6         312.0         263.8