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===Learning objectives===
===Learning objectives===
−Purpose of having longitudes
+#Purpose of having longitudes
−Idea of time zones from longitudes (why do we need time zones?)
+#Idea of time zones from longitudes (why do we need time zones?)
−Longitudes are 'half curves' meeting at the two poles (Latitudes are full curves, encircling the earth at that plane)
+#Longitudes are 'half curves' meeting at the two poles (Latitudes are full curves, encircling the earth at that plane)
===Notes for teachers===
===Notes for teachers===