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.


Splendid Sundog over Montreal, Canada

January 24, 2023


_IMG_2752

Photographer: Raymond Murphy

Summary Author: Raymond Murphy; Jim Foster

Featured above is a colorful, right sundog (parhelion) as observed
from near Montreal, Quebec on the morning of November 26, 2022. You can
tell it’s on the right side of the Sun because with halos the red
color is nearest the solar disk, unlike with rainbows. Sundogs are one
of the most commonly observed optical phenomena. Look for them some
22-degrees away from the Sun, at the same solar altitude, whenever
cirrus clouds (composed of ice crystals) are in the sky. Note
that the puffy cloud in the foreground is a cumulus type cloud --
composed of water droplets. The "tail" of this sundog is actually a
portion of the parhelic circle. Always be careful when looking
anywhere in the vicinity of the Sun.


West Montreal, Quebec, Canada Coordinates: 45.4515, -73.6334


Related EPODs

Splendid Sundog over Montreal, Canada The Fisherman and the
Full Omega Moon Inferior Mirage off the Coast of Sicily
Crepuscular Rays Observed from Italian Alps Halo Display
Observed from Graubunden, Switzerland Lunar Green Flash Sequence
More...

Atmospheric Effects Links

* Atmospheric Optics
* Optic Picture of Day: Gruppo Astrofili Galileo Galilei
* Color and Light in Nature
* The Colors of Twillight and Sunset
* Refraction Index
* Image Gallery: Atmospheric Effects
* What is a Rainbow?

-
Earth Science Picture of the Day is a service of the Universities
Space Research Association.

https://epod.usra.edu

--- up 47 weeks, 1 day, 21 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

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.


Dance Hall Rock and Tafoni

February 24, 2023

TomMc_EPOD.DancehallRockTom (004)

TomMc_EPOD.TafoniWithinTafoniDanceHallRock2022 (003)

Photographer: Thomas McGuire

Summary Author: Thomas McGuire

In 1879 a group of 236 Mormons answered the call to trek 200 miles
(320 km) from their homes in southwestern Utah eastward across
partially explored high desert to populate the San Juan River
Valley. They had selected an unexplored “shortcut” to avoid an extra
hundred miles of travel.

This natural alcove (top photo), called Dance Hall Rock, provided a
place for the travelers to rest and to re-purpose themselves as scouts
looking for a way to access the Colorado River, more than 1,000
feet (305 m) down a sheer cliff. They found a cleft in the rock where
they had to chisel and dynamite an extremely steep and narrow ascent;
so steep that both wagons and horses had to be lowered separately on
ropes to the river below. After nearly a year of treacherous travel,
they arrived two persons stronger than they left with no fatalities and
two babies born along the journey.

The alcove probably resulted from a layer of resistant, Jurassic
aged Entrada sandstone, including many tafoni (bottom photo),
overlying less resistant sandstone layers that over time had been
hollowed out by wind and rain. Photos taken on May14, 2022


Dance Hall Rock, Utah Coordinates: 37.357151, -111.100474


Related EPODs

Dance Hall Rock and Tafoni La Scala dei Turchi Atacama
Lagoon and Sagittarius Arm of the Milky Way The Snake River’s
Formidable Hells Canyon Joggins Fossil Cliffs Salt Pans of
Torre Nubia
More...

Geography Links

* Atlapedia Online
* CountryReports
* GPS Visualizer
* Holt Rinehart Winston World Atlas
* Mapping Our World
* Perry-Castañeda Library Map Collection
* Types of Land
* World Mapper

-
Earth Science Picture of the Day is a service of the Universities
Space Research Association.

https://epod.usra.edu

--- up 51 weeks, 4 days, 21 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)