The way we experience sunrise on Earth is so gradual. The black outside your window slowly turns to gray. You see a few glimmers of light reflecting off the buildings across the street. In space there is literally a line that bisects the Earth. On one side of it there is darkness. On the other side there is light. The line sweeps west, swiftly and steadily, coming across Europe, across the Atlantic, across Florida, across Texas. I watched this line coming toward me. Then I looked past it up toward the sun. Then I looked back at the line again and realized: The line isn’t moving. The sun isn’t
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