The vernal equinox happened last week on March 20. It's spring! Days are now longer than nights north of the equator, and I'm thinking about summer! But consider the big picture. It's sunrise in the Arctic, it's autumn south of the equator, and it's twilight as the Sun sinks below the horizon for the 6 month winter night in Antarctica. Do all parts of the Earth receive the same number of daylight hours from the Sun over the year? Do all parts of the Earth receive the same warmth from the Sun? (Is that different?) How does this effect life?
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