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Astronaut Captures A Never-Setting Sun In The First Vine From Space

It takes approximately 92 minutes for the International Space Station (ISS) to do a lap around Earth. In this, first ever Vine Video from Space, cosmonaut Reid Wiseman reduces one orbit into the duration of about six seconds. But there's something uncommon about this time-lapse. Team members aboard the ISS can see as many as 16 sunrises and sunsets in a 24 hour period. However, as Wiseman records in his Vine, the sight from space changes significantly when the Space Station's orbit comes into arrangement with the day/night terminator line, i.e. the block between light and dark on the surface of the Earth.

The angle between Earth's revolving axis and the level in which it orbits the sun is 23.4°. This "axial tilt" sources one pole to be pointy toward the Sun on one side of the planet's orbit and the other pole on the other side. This describes that the alignment of the day/night terminator line is continuously changing. In the recording above, the alignment of the terminator line along Earth's surface can be seen traveling over two solstices and two equinoxes in its annual, metronomic dance.

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