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- 800 REM CALENDAR --> JD
- 805 REM
- 810 INPUT "Y,M,D ";Y,M,D
- 815 INPUT "JC (0) OR GC (1) ";G
- 820 D1=INT(D): F=D-D1-0.5
- 825 J=-INT(7*(INT((M+9)/12)+Y)/4)
- 830 IF G=0 THEN 850
- 835 S=SGN(M-9): A=ABS(M-9)
- 840 J1=INT(Y+S*INT(A/7))
- 845 J1=-INT((INT(J1/100)+1)*3/4)
- 850 J=J+INT(275*M/9)+D1+G*J1
- 855 J=J+1721027+2*G+367*Y
- 860 IF F>=0 THEN 870
- 865 F=F+1: J=J-1
- 870 PRINT "J.D.: ";J;F
- 875 END
- 880 REM ------------------------
- 885 REM APPEARED IN ASTRONOMICAL
- 890 REM COMPUTING, SKY & TELE-
- 895 REM SCOPE, MAY, 1984
- 900 REM ------------------------
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