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The Moon is normally the brightest object in the night sky, even in a crescent phase.
The greatest luminosity, apparent magnitude −4.9, occurs during crescent phase when it is near Earth.
A long-standing mystery of Venus observations is the so-called ashen light an apparent weak illumination of its dark side, seen when the planet is in the crescent phase.
It has been shown that Earth's phase function only deviates significantly from a Lambertian function near crescent phase (phase angles near zero) where glint (specular reflection from the ocean) and cloud forward scattering become important (Williams and Gaidos, 2008; Robinson et al., 2010).
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For example, if you searched for "Isaac Newton birth," you got Newton's birth date (December 25, 1642; you also learned that the moon was in the waxing-crescent phase that day).
David Talbot ("Search Me," July/August 2009) describes a Wolfram Alpha search revealing that on the day of Sir Isaac Newton's birth, December 25 , 1642 the moon was in the waxing-crescent phase.
Waning crescent: The last phase of the moon.
He is currently spearheading Reinventing the Crescent, a multi-phase initiative to develop six miles of the city's under-used riverfront into tree-lined public promenades and outdoor recreation spaces.
Traditionally the orbit of Venus was placed entirely on the near side of the Sun, where it could exhibit only crescent and new phases.
After maximum phase, the crescent of the Sun widens again until the Moon passes out of the Sun's disk at the last contact.
After Galileo's telescopic observations of the crescent, gibbous and full phases of Venus, therefore, this Ptolemaic model became untenable.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com