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

Images Dated 27th April 1999

Choose from 16 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 Image

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