Waning gibbous moon on Feb 19, 2011 - natural view. Photo by Ari Heinze.

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Though only one day has passed since the previous image, this is obviously no longer a full moon. Click back and forth between this and the previous image to see not only the change in illumination, but also the subtle yet visible effect of libration over just one day. To see the libration, pay attention to how far craters and other features are from the lunar limb in the two different images.

Date/Time	February 19, 2011, about 22:55 CST
Equipment	Home-built eight-inch F/5 Newtonian telescope plus Nikon D3000 DSLR
Settings	Telescope stopped to about F/20 using cardboard mask. Film speed set to 100 ISO. Exposure time 1/15 sec. White balance auto.
Image processing	Cropped and resized for web to 1500 pix width.
Image dimensions before resizing	2316x1800
Focus	Good: almost no blurring visible even in the full-resolution raw image.
Motion blur	Negligible
Image noise	Low
Other technical comments	None.

Copyright 2011 Ari Heinze: all rights reserved.

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