diff --git a/2019/day10.py b/2019/day10.py
new file mode 100644
index 0000000..749bd84
--- /dev/null
+++ b/2019/day10.py
@@ -0,0 +1,47 @@
+import math
+
+
+def main():
+    with open("day10.txt", "rt") as input_file:
+        amap = [line.rstrip() for line in input_file.readlines()]
+
+    ast_positions = []
+    for x, line in enumerate(amap):
+        for y, value in enumerate(line):
+            if value == "#":
+                ast_positions.append((x, y))
+
+    best_vis = 0
+    for pos in ast_positions:
+        best_vis = max(best_vis, num_visible_asts(ast_positions, pos))
+
+    print("Best visibility is", best_vis)
+
+def num_visible_asts(asts, ref):
+    count = 0
+    for ast in asts:
+        if ast[0] == ref[0] and ast[1] == ref[1]:
+            continue
+        if is_visible(asts, ref, ast):
+            count += 1
+    return count
+
+def is_visible(asts, ref, target):
+    for ast in asts:
+        if ast[0] == ref[0] and ast[1] == ref[1]:
+            continue
+        if ast[0] == target[0] and ast[1] == target[1]:
+            continue
+        if is_on_line(ref, target, ast):
+            return False
+    return True
+
+def is_on_line(a, b, p):
+    return math.isclose(dist(a, b), dist(a, p) + dist(b, p))
+
+def dist(a, b):
+    return math.sqrt((a[0] - b[0]) ** 2 + (a[1] - b[1]) ** 2)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2019/day9.py b/2019/day9.py
index 982805d..a83db20 100644
--- a/2019/day9.py
+++ b/2019/day9.py
@@ -9,7 +9,6 @@ EX3 = "104,1125899906842624,99"
 def main():
     with open("day9.txt", "rt") as input_file:
         text = input_file.readlines()[0].rstrip()
-    
     codes = Intcode.parse_input(text)
 
     # Part 1