25.7 MB (531.4 KB compressed)
3631 x 2478 pixels
30.7 x 21.1 cm ⏐ 12.1 x 8.3 in (300dpi)
LARRY LANDOLFI / SCIENCE PHOTO LIBRARY LARRY LANDOLFI / SCIENCE PHOTO LIBRARY
22 day old moon, one dast past last quarter. Image 22 of 27. Waning (decreasing in apparent size) half Moon 22 days into its 28-day cycle (last quarter). The lunar phases arise as the Moons orbit of the Earth shows the Earth-facing side moving into and out of the light of the Sun. This Earth-facing side of the Moon is locked in place by the gravitational influence of the Earth. This results in a lunar day that equals the length of the lunar Earth orbit. On a waning Moon the day-night line (terminator) marks the lunar sunset.
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