Location, Location, Location
The old real estate agent's mantra does not really apply here because you can be just about anywhere on the earth where it's daytime at the time of the transit. Below you can see two globes. The top globe is where you had to be to see the beginning of the transit, and (rotated just a bit) the bottom globe is where you had to be to see the end of the transit. If your location was on both globes, you saw the whole thing. Note that this transit was visible from most of North America, all of the Pacific, the west coast of South America, Australia, New Zealand, and Indonesia.
If your location was on this part of the globe, you saw the start of the transit.
If your location was on this part of the globe, you saw the end of the transit.
If your location is visible on both globes, you saw the whole thing. One important note - in Australia, all but the northern coast only saw a partial transit. Mercury did not completely enter the sun's disk (called a "grazing transit"). This is really a matter of perspective. Because you are located further south, Mercury will appear further north against the sun's disk. This is a phenomenon called parallax. This type of transit is EXTREMELY rare!
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