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INTRODUCTION
There’s a saying attributed to the ancient Roman Seneca: If one does not know to which port one is steering, no wind is favorable. So we’ve known for thousands of years that we can’t plan without knowing our destination. It’s just as true that we can’t map our course without knowing our starting point. We don’t think as much about that because we take it for granted that we already know it. Still, let’s imagine that we’ve left port knowing our destination is due east. A sudden storm blows our vessel off course and then the sun comes out again. What should our heading be now? From the information provided, it’s impossible to know.