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June 21 marked the start of astronomical summer
in the Northern Hemisphere.

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The summer solstice is the moment the hemisphere

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reaches its greates tilt toward the sun.

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NOAA's GOES-16 and 17 satellites constantly observe

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the same region of Earth, allowing a view

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of the terminator as it moves.

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The terminator is the edge between the shadows of nightfall

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and the sunlight of dusk and dawn.

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The slope of the terminator curve changes with the seasons.

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The summer solstice is the longest day, and shortest night, of the year.

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As the Earth rotates on its axis, the North Pole experiences 24 hours

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of daylight, while the South Pole is obscured in darkness.

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As the seasons change, NOAA satellites observe
the markers of transition.

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Earth From Orbit: Summer Solstice

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NOAA Logo

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NASA Meatball

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