fix old bug in lunar.fc

README.md

@@ -97,7 +97,7 @@ The "auto" monitor command auto-types a text file into the terminal. If you are
 
 Several FOCAL source code files are included:
 
-* lunar.fc ([Lunar Lander](https://en.wikipedia.org/wiki/Lunar_Lander_(video_game_genre)))
+* lunar.fc ([Lunar Lander](https://en.wikipedia.org/wiki/Lunar_Lander_(video_game_genre))) with the [2024 bug fix](https://martincmartin.com/2024/06/14/how-i-found-a-55-year-old-bug-in-the-first-lunar-lander-game/)
 * ham.fc ([Hamurabi](https://en.wikipedia.org/wiki/Hamurabi_(video_game)))
 * mand.fc ([Mandelbrot set](https://en.wikipedia.org/wiki/Mandelbrot_set))
 * fib.fc ([Fibonacci numbers](https://en.wikipedia.org/wiki/Fibonacci_number))

lunar.fc

@@ -38,7 +38,7 @@
 07.10 I (S-.005)5.1;S S=2*A/(V+FSQT(V*V+2*A*(G-Z*K/M)))
 07.30 D 9;D 6;G 7.1
 
-08.10 S W=(1-M*G/(Z*K))/2;S S=M*V/(Z*K*(W+FSQT(W*W+V/Z)))+.05;D 9
+08.10 S W=(1-M*G/(Z*K))/2;S S=M*V/(Z*K*(W+FSQT(W*W+V/(2*Z))));D 9
 08.30 I (I)7.1,7.1;D 6;I (-J)3.1,3.1;I (V)3.1,3.1,8.1
 
 09.10 S Q=S*K/M;S J=V+G*S+Z*(-Q-Q^2/2-Q^3/3-Q^4/4-Q^5/5)