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Home > All Images > 1999 > April > 27 Apr 1999

Images Dated 27th April 1999

Choose from 7 pictures in our Images Dated 27th April 1999 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Optical image of a waxing crescent Moon Featured 27 Apr 1999 Print

Optical image of a waxing crescent Moon

Waxing crescent Moon. Image 2 of 27. Optical image of a waxing (increasing in apparent size) crescent Moon 2 days into its 28-day cycle. The lunar phases arise as the Moon's 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 waxing Moon the day-night line (terminator) marks the lunar dawn. The Moon is crescent when it is less than half full. Taken in September 2001. A sequence of the monthly cycle of Moon phases is shown on images R340/644-670

© JOHN SANFORD/SCIENCE PHOTO LIBRARY