EPOD - a service of USRA
The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.
Paraselene and Pooch
January 16, 2020
Paraselene l
Photographer: Marcella Giulia Pace
Summary Authors: Marcella Giulia Pace; Jim Foster
Shown above is the waning gibbous Moon as observed over the
Modica countryside of Sicily, Italy on the night of December 15,
2019. At right center is a parselene or moon dog. Although
22-degree lunar halos are commonly seen when the Moon is in the
gibbous and full phases, other halos features, such as moon dogs
are rarely noticed since the MoonΓÇÖs light is too feeble to make
them as conspicuous as their daytime counterparts ( sundogs).
TheyΓÇÖre formed when moonlight moves through oriented, hexagonal,
plate-shaped ice crystals. These crystals are either
free-falling in the atmosphere or more likely, contained in
cirrus clouds. As moonlight enters one of the crystalsΓÇÖ side faces
itΓÇÖs bent by approximately 22 degrees before exiting an alternate face.
Thus, theyΓÇÖre seen 22 degrees away from the Moon and also at the same
altitude as the Moon
Moon dogs can only be seen when the MoonΓÇÖs not too high up in the sky
(below 61 degrees above the horizon or 29 degrees from the zenith). As
can be seen at bottom center, these moon dogs arenΓÇÖt the only dogs
visible on this photo. My pooch made an unexpected appearance as I
snapped the shutter.
Photo Details: Camera: NIKON D7100; Software: Adobe Photoshop CC 2014
(Macintosh); Exposure Time: 30.000s; Aperture: ƒ/2.8; ISO equivalent:
100; Focal Length (35mm): 16; Lens: Tokina AT-X 116 PRO DX 11-16mm
F2.8.
* Modica, Italy Coordinates: 36.85, 14.766667
Related EPODs
Paraselene and Pooch Alpenglow and Moonrise Anticrepuscular
Rays Observed Over Miami Beach, Florida Sunrise Sequence Observed
from Sicily Position of Full Moon at Winter and Summer Solstice
Brocken Spectre and Glory from the Agrafa Mountains of Greece
More...
Atmospheric Effects Links
* Atmospheric Optics
* Color and Light in Nature
* The Colors of Twillight and Sunset
* Refraction Index
* Image Gallery: Atmospheric Effects
* What is a Rainbow?
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Earth Science Picture of the Day is a service of the Universities
Space Research Association.
https://epod.usra.edu
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