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Task/Horizontal-sundial-calculations/LiveCode/horizontal-sundial-calculations.livecode

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+on mouseUp
+    ask "Enter lng,lat,meridian"
+    if it is empty then exit mouseup
+    // -150.5, -4.95, -150.0
+    put item 1 of it into longitude
+    put item 2 of it into latitude
+    put item 3 of it into meridian
+
+    repeat with hour = 6 TO 18
+        put 15 *hour - longitude + meridian - 180 into hra
+        put rad2deg(atan(sin(deg2rad(latitude)) * tan(deg2rad(hra)))) into hla
+        if abs(hra) > 90 then put hla + 180 * sgn(hra *latitude) into hla
+        put hour && hra && hla & cr after sunhours
+    end repeat
+    put sunhours
+end mouseUp
+
+function rad2deg theta
+    return theta * (180 / pi)
+end rad2deg
+
+function deg2rad theta
+    return theta * (pi / 180)
+end deg2rad
+
+function sgn x
+    if x >0 then return 1 else return -1
+end sgn