Friday, October 07, 2011
Rotation Around Polaris
This time-lapse image shows how the night
sky appears to revolve around Polaris as the
Earth spins on its axis. Polaris (aka the North Star)
is positioned directly abopve the Earth's geographic north
pole, so is centedered on Earth's axis. It appears
as a stationary dot in the center of the rotating star field.
Eclipse Amazingness
This is the "pinhole effect" that happens under a tree
during a solar eclipse.
See all of the little crescent suns?
Wow, look at these.
The moon's shadow darkens part of Earth during a solar eclipse. Only people underneath the center of that dark spot will see the total eclipse; others will see a partial eclipse. This shot was taken from the Mir space station in August 1999.
Photograph courtesy Centre National d'Etudes Spatiales
The moon's lunar highlands (light areas) and maria, or volcanic plains, (dark areas) are clearly visible in this photograph taken by the Expedition 10 crew onboard the International Space Station. Photograph courtesy NASA
These pictures are from National Geographic Photography.
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