initial commit / add all books

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diff --git a/2409/CH2/EX2.4/Ex2_4.sce b/2409/CH2/EX2.4/Ex2_4.sce
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+
+//Variable Declaration
+aE=6378.141     //Earth's equitorial radius(km)
+e=0.002         //Eccentricity
+p=12            //period from perigee to perigee (hours)
+K1=66063.1704  //Constant (km^2)
+u=3.986005*(10**14)         //Earth's Gravitational constant(m^3/sec^2)
+
+
+//Calculation
+n=(2*%pi)/(12*60*60)            //Mean Motion(rad/sec)
+anp=((u/n**2)**(0.3333))/1000      //Radius of the orbit by kepler's 3rd law(km)
+k2=(1-e**2)**1.5
+
+function [y]=f(a)
+    y=(n-((u/a**3)**0.5)*(1+K1/a**2*k2))
+endfunction
+a=fsolve(2,f)
+a=a/1000  //Converting a into km
+
+//Result
+
+printf("The nonperturbed value of semimajor axis is %.2f km",anp)
+printf("\nThe perturbed value of semimajor axis is %.2f km",a)
+