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10 : CLEAR : PAUSE “Mini Moon Age Calculator “
20 : W=694098 : X=29.53 : Z=365.25 : JN=2460202.6 : REM Julian date for last moon on 25/9/2023 at 2:39am
30 : INPUT “DAY:” ; D , “MONTH:” ; M , “YEAR:” ; Y
40 : IF M&lt;=2 LET Y=Y-1 : M=M+12
50 : A=INT(Y/100) : B=INT(A/4) : C=2-A+B : E=INT(Z * (Y+4716))
60 : F=INT(30.6001 * (M+1)) : JD=C+D+E+F-1524.5 : DS=JD-JN
70 : S=(DS/X-INT(DS/X)) * X : S=INT(S+.5)
80 : PRINT “Age of Moon “ ; USING “###.# “ ; S ; “_days” : END

Stay SHARP!

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kd5njr@mastodon.sdf.org ⁨1⁩ ⁨year⁩ ago
@peron
cool routine.
@guofu : note computation of Julian Date. and then some trig for the periodic part(s)
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