Add timezones as a unit of length

macrovision.js

@@ -77,6 +77,12 @@ math.createUnit("marathons", {
     definition: "26.2 miles",
     prefixes: "long"
 });
+math.createUnit("timezones", {
+    definition: "1037.54167 miles",
+    prefixes: "long",
+    aliases: ["timezone", "timezones"]
+});
+
 math.createUnit("earths", {
     definition: "12756km",
     prefixes: "long"
@@ -318,6 +324,7 @@ const unitChoices = {
             "stories",
             "buses",
             "marathons",
+            "timezones",
             "earths",
             "lightseconds",
             "solarradii",