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Date + Time
............................... 25/ 4 / 2013 - 16:15 UTC
Location .................................... Nunki
Observatory
Optics .........................................
Canon EFS 18-200 mm (working at 18mm - f/3.5)
Camera .....................................
Canon Eos 50D
Exposure Time......................... ISO 400-800 - 25X30 sec
Mount ....................................... portable
tripod
Processing Details ................. Photoshop CS
5
Details ......................................
Summary Authors:
Nikos
Paschalis;
Jim Foster (EPOD)
The image above is a
time lapse of the
full Moon rising over
Skiathos Island (in the background), Greece. It's composed of
approximately 20 frames taken 30 seconds apart on the evening of
April 25, 2013. Note that the
Moon subtends the same angle of the sky (1/2 degree) during its
rise -- it's
not any bigger when it breaks the horizon than it is when well
up in the sky. However, the color of the
Moon does
change as moonrise progresses from red to orange to yellow to white.
These color changes are attributed to changes in the
path length of moonlight that reaches our eyes. Red colors (long
wavelengths of visible light) result from the longer path
lengths when the
Moon is
very low in the sky. As the
Moon
rises higher and higher, our atmosphere scatters the longer
wavelengths about as much as the shorter wavelengths, so the
Moon appears white.
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