A friend and colleague at work sent me these pictures of funny architectural and engineering flubs. Click on the triangle to start the slide show . . .
Nerdliness
Cross-Quarter Days – Happy Imbolc!
Today is February 3rd which is a cross-quarter day. During Earth’s orbital motion, cross-quarters occur midway between solstices and equinoxes. They have been observed by cultures for many, many centuries. Today, for example, might have been the day that nomadic tribes may start their journey toward spring hunting and gathering lands.
Image: Imbolc – click for a complete orbital depiction.
In our culture, we consult a fat rodent for a non-scientific weather prediction – sort of like Al Gore, in a way.
A good place to read about equinoxes, solstices and cross-quarters is Archeoastronomy.com. The cross-quarter days are summarized below the break:
Thus, Imbolc was the beginning of Spring. Imbolc corresponds more or less to Groundhog Day in the USA, February 2, when tradition has it that if a sleepy groundhog creeping out of its burrow at dawn sees its shadow, there are 6 more weeks of winter. (If not, we surmise, only 42 days remain.) Solmonath and Candlemas were Church-approved substitute names for Imbolc, which is spelled Imbolg by some pagans. Druids prefer Oimeaig, pronounced IM-mol’g.
Winter Solstice
Today is Solstice, the shortest day in the Northern Hemisphere – according to the solar ephemeris for our location, the length of our day will be approximately nine hours and fifty-four minutes.
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The table at the left shows the various events associated with the motion of the Earth at our longitude and latitude. Twilight is the time when first light from the sun begins to illuminate the atmospheric particles or when last light ceases illumination. Sunrise and sunset are the times when the limb (edge) of the sun peeks above or disappears below the horizon. Transit is when the sun midpoint crosses the meridian, or longitude of our location. | ||||||||||||||||
The graphic below is taken from a very interesting website, Archaeoastronomy.com. On their website, you can learn about Equinoxes, Solstices and Cross Quarters which are moments shared planet-wide, defined by the earth’s tilt and the sun’s position on The Ecliptic along 45° arcs.
This neat graphic is put into motion on Archaeoastronomy.com.
The Mount Wilson Tower Cam
One way to keep track of the weather is to find webcams near the area in which you’re interested. Today, after the storm passed through, I took a look at the webcam on the Mount Wilson Solar Observation Tower. I saw this snowy fairyland and the observatory dome housing the famous Hooker 100 inch Newtonian Telescope at the left.
Here’s some history on the Hooker Telescope from the Mount Wilson Observatory:
The Hooker 100-inch telescope is named after John D. Hooker, who provided the funds for the giant mirror. It was the largest telescope in the world from 1917 to 1948 when the 200-inch telescope was built on Palomar Mountain 90 miles to the southeast. Many great discoveries were made with the 100-inch telescope Edwin Hubble’s refinement of the distance scale of the universe. The first optical interferometer ever used for astronomical research was used on the 100-inch telescope to measure the sizes of distant stars for the first time in 1919.
The 100-inch telescope has three optical configurations available to meet the requirements of a wide variety research projects. A very high-resolution spectrograph is located at the telescope’s Coudé focus. Located on the ground floor of the 100-inch telescope dome, the Aluminizing Room is used to recoat all of the telescope mirrors at the observatory.
Fog at Two Harbors
I like to internet surf to the webcams at Catalina Island from time to time. This gives me a current perspective on the weather patterns and island activity. Today, I looked at the webcam at Two Harbors and saw this foggy apparition of Ship Rock looming in the distance.
Some days, though, it is clear enough to see the mainland and even the mountains inland. Roll the cursor over this image to see a clear day from Two Harbors.
The Ghost of Cassini
On this Halloween, the spooks and spirits are reaching far into space. This whimsical presentation of the Cassini Saturn mission, with ghost, pumpkin and black cat demonstrates a lighter side of NASA for the Halloween holiday.
