ISS042-E-83031

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Spacecraft nadir point: 43.4° N, 75.2° W

Photo center point: 47.0° N, 71.0° W

Nadir to Photo Center: Northeast

Spacecraft Altitude: 219 nautical miles (406km)
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Image Caption: Eastern Canada, Day and Night

Astronauts aboard the International Space Station took these day and night midwinter panoramas of the St Lawrence River in eastern Canada. The seaway can be seen in the day image crossing the image from lower left to top right. Clouds mask its full width where the river widens into the Gulf of St Lawrence (top right). This major river that connects the Great Lakes to the Atlantic Ocean is invisible in the night image--only two lines of the lights of small towns indicate its shorelines. The night image does show the city of Montreal as the major cluster of lights (lower center). Night lights also make it quickly apparent that the provincial capital, Quebec City (population 0.77 million), is smaller than greater Montreal (population 1.1 million). Neither city stands out visually in the day image.

The day image shows that dry, cloudless air is moving southeast and picking up moisture as soon it streams over the St Lawrence River. The moisture appears as numerous tendrils of cloud that stream out into the Atlantic Ocean (image right). A long cloud streamer also rises from Lac Saint-Jean (image left), although the lake is nearly iced over. The night image shows that the lake is ringed by small settlements. The night image also shows a distant green aurora and airglow on the horizon (image top left).