City Creek Nature Notes – Salt Lake City

December 19, 2016

December 19th

Filed under: Astronomy, Light, Moon — canopus56 @ 1:23 pm

Iridescent Moon

8:00 a.m. I go for an early morning jog up City Creek, and under a clear early morning sky, a third-quarter moon hangs in the sky. Its image is a false negative. Elevated highlands are in white, but the lowland “seas” are filled-in with blue.

7:00 p.m., December 14th. From December 12th through the 14th, there have been several overcast days has been overcast as the Moon’s phase reached and passed full Moon. For several nights over the canyon the near full Moon hangs high overhead as it pierces the clouds, the Moon is surrounded by a circular halo of rainbow colors. The ice crystals are forming prisms that disperse the light into its components.

On December 19th, 1890, City Engineer Doremous rejected the idea of putting a dam in City Creek Canyon to assure an adequate water supply for the City, and he opined that “It would be a dangerous and expensive undertaking. The fall [the gradient] is so great that even a very high dam would not back it up very far” (Salt Lake Times). He also felt that a City Creek dam would quickly fill with sediment and become unsuitable for drinking water.

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