Category: ceu

Conjunction: Venus and MoonImage credit: Roger…

Conjunction: Venus and Moon

Image credit: Roger Hutchinson & Michael DeWoody

Halo (optical phenomenon)

Halo (optical phenomenon)

Halo is the name for a family of optical phenomena produced by light interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky. Many of these are near the Sun or Moon, but others occur elsewhere or even in the opposite part of the sky. Among the best known halo types are the circular halo (properly called the 22° halo), light pillars and sun dogs, but there are many more; some of them fairly common, others (extremely) rare.

The ice crystals responsible for halos are typically suspended in cirrus or cirrostratus clouds high (5–10 km, or 3–6 miles) in the upper troposphere, but in cold weather they can also float near the ground, in which case they are referred to as diamond dust. The particular shape and orientation of the crystals are responsible for the type of halo observed. Light is reflected and refracted by the ice crystals and may split up into colors because of dispersion. The crystals behave like prisms and mirrors, refracting and reflecting light between their faces, sending shafts of light in particular directions.

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Aurora Over Alaska Credit: Joshua Strang, US…

Aurora Over Alaska 

Credit: Joshua Strang, USAF, Wikipedia

Photo of the comet Hale-Bopp above a tree. …

Photo of the comet Hale-Bopp above a tree. This picture was taken in the vicinity of Pazin in Istria/Croatia during a short easter holiday.

credit: Philipp Salzgeber  

Orion Arising Image Credit: NASA, ISS Ex…

Orion Arising

Image Credit: NASA, ISS Expedition 40, Reid Wiseman

Earthshine – Jan 14, 2013 by Joseph Brimacomb…

Earthshine – Jan 14, 2013 

by

Joseph Brimacombe

Abandoned building from the early 1900’s…

Abandoned building from the early 1900’s, with the moon captured through the window.

By Dewald Van Rensburg

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Star Trails Over Mount Cook 4 – March 27, 2007…

Star Trails Over Mount Cook 4 – March 27, 2007

by: Joseph Brimacombe

Venus, Mars, Spica and a Meteor Caught;The Ple…

Venus, Mars, Spica and a Meteor Caught;
The Pleiades, Hyades and Orion.

by: Joseph Brimacombe