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Public Events at Observatory Park Turner Farm - 2025
Wednesday, 29 January 2025 22:41Lunar Eclipse Public Viewing Session Friday March 14 from 1 AM to 5 AM View a total Lunar eclipse in the early hours of Friday, March 14 at the observatory at Turner Farm. The subtle penumbral...
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Winter-Spring Courses and Events at Observatory Park - 2025
Saturday, 19 August 2023 14:48Check the main page of this Analemma website https://www.analemma.org/ or @AnalemmaSociety on X (formerly twitter) for event updates. Class Registration at:...
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Winter - 2025 - Public Observing on Friday Nights
Saturday, 19 June 2021 18:12Observatory Park at Turner Farm The Analemma Society holds Friday Night Public Viewing Sessions at Turner Farm in Great Falls, VA. Current: Friday night hours 7:30 - 9:30 PM Apr 11 to May 2: Friday...
How large is our solar system?
We've all seen in books drawings of our solar system. The drawing of the sun, planets and moons, and the dwarf planet pluto all seem to fit nicely on the centerfold. Since the enlightenment, scientists have devised orraries to show the planets and their motions. But we're fooling ourselves.
The planets and moons are tiny compared to the sun and their is tremendous empty space between them. How much empty space?
Go to: https://joshworth.com/dev/pixelspace/pixelspace_solarsystem.html At the bottom of the window are tiny < and > scroll buttons and a small square slider to walk you from the sun to pluto. For the size of the sun (scaled so that our moon is one pixel on your screen) the length of the scrolling chart is 457 feet (139m).
Lost in space? Come to Obervatory Park at Turner Farm and walk from the gate to the Roll-Top Observatory. We've laid out the distance of the planets in real scale (but even then we've cheated on the sie of the planets so that you can see them).
For Josh Worth's website, here is a cheat sheet for finding the planets (He uses the mean distance from the sun in kilometers).
There's a lot of empty space between. Try it on our walkway.
Venus - 108 million km
Earth - 149 million km
Mars - 228 million km
Jupiter - 778 million km
Saturn - 1.43 billion km
Uranus - 2.87 billion km
Neptune - 4.5 billion km
Pluto - 5.9 billion km
Planets Align - Jan-Feb 2025
Well, alignment is perhaps an overused word. But during late January and into February six planets will be visible
as Venus, Mars, Jupiter, Saturn, Uranus and Neptune are all visible in the night sky. Uranus and Neptune can't be seen without binoculars or a telescope. That leaves Venus, Mars, Jupiter and Saturn to put on a show.
Venus and Saturn are very close together in the south-west sky. High in the south above the constellation of Orion, you'll see Jupiter shining bright. High in the east is the red planet Mars. No need to rush, but join us on Friday nights 7:30-9:30pm for free public observing through telescopes at Observatory Park, Turner Farm. (Observing is weather dependent. Check here at the website for our notice or check @AnalemmaSociety on X (formerly Twitter) or on the AS Facebook account. Best to check before driving to the park and finding that we're not open because of poor or very cold weather. )
The four planets will be visible during January and February. Jupiter and Mars will be visible through the Spring. Take care for outside observing and dress warmly. No reservations required. Or, register to come to the Astronomy Festival on the evening of February 15. For the Astronomy Festival, registar at: http://www.fairfaxcounty.gov/parks/parktakes/
Observatory Park has a New Telescope
Observatory Park at Turner Farm has a new telescope officially described as a "GSO 16 f/8 Ritchey-Chretien" telescope, purchased from Highpoint Scientific. The telescope is an open-tube truss (called a Serrurier truss) made of light-weight carbon fiber that holds the 16-inch quartz primary mirror. The RC assembly by Guan Sheng Optical (GSO) offers both visual observing and astronomical imaging.
The Ritchey-Chretien optical design means that both the primary mirror and secondary mirror are hyperbolic, a unique design that prevents both coma and chromatic aberation. The f/8 is the aperture ratio of primary mirror diameter to focal length, requiring the 16 inch mirror to have a tube that is about 45 inches long
Even though the mechanical design uses an open-tube truss, the primary mirror is mounted in a cell that is heavily baffled to prevent stray light and has cooling fans to provide temperature stability. The secondary mirror at the top of the open-tube truss is also baffled to prevent stray light.
Analemma Society selected this fine telescope to provide not only visual observing, but remote telescopic operation using CCD/CMOS cameras for astronomical imaging of the moon, planets, star clusters, nebulae and galaxies.
Photo Credit: Bill Burton
Analemma Society covered by NBC on-line News
Emily Hung and crew from NBC created a 5-minute piece on light pollution, one of a series of 5-minute videos called Washington Wonders. At the beginning, Analemma Society President Jeff Kretsch is interviewed about seeing the night and providing astronomical outreach to the public (historic images of Observatory Park supplied by Christina Tyler Wenks. Tom Reinert, President of Dark Sky International discussed the impact of light pollution on wildlife and the importance of educating the public. Jill Johnson of the Smithsonian Natural History Museum and Anne Lewis, Co-Founder of City Wildlife, focused on the brightening night sky's impact on migratory birds. Emily Hung commented in an email to Analemma Society,"Thank you for your patience and taking the time to share your expertise of the subject! My colleagues are currently working to get the story on NBC’s digital page..." Meanwhile, she shared an advanced copy of the NBC video intended for their on-line magazine with Analemma Society, presented below and temporaroily available at f.io/WhWV9Uwu
Circumzenithal Arc to End the Year
Dr. Jeff Kretsch frequents Observatory Park at Turner Farm and on the last day of 2023 took this photo of the sun's circumzenithal arc (sometimes called Bravais' arc) about 48 degrees from the sun, showing a rainbow of color. The arc (actually part of a circular halo) is created by plate-shaped ice crystals in the Cirrus clouds. The center of the arc appears to be at zenith (hence its name). For the sun angles to refract from the ice crystals to an observer on the earth, the elevation of the sun must be less than 32 degrees above the horizon. Note that blue is "on top" and red is "on the bottom". A normal rainbow created by water droplets has red on top.
NASA Astronomy Picture of the Day - 19 Dec 2023
One of our Analemma Society volunteers, Steven Powell, is a dedicated astronomical observer. In a recent email, he said, "I'm happy to say that my 32 hour exposure image of the California nebula [NGC 1499] will be displayed as the NASA Astronomy Picture of the Day on December 19th." You can find the full-size image on the NASA website: https://apod.nasa.gov/apod/ap231219.html At right is a small thumbnail view.
His photograph and hundreds of other spectacular views of the cosmos can be found in the NASA Astronomical Picture of the Day archive at: https://apod.nasa.gov/apod/archivepix.html
Analemma Society honored with FCPA Harold Strickland Partnership Award
The Fairfax County Park Authority awarded Analemma Society the 2023 Harold Strickland Award for Collaboration and Partnership for creating programming for Observatory Park visitors that minimizes or eliminates park bond funding. This award, https://www.youtube.com/watch?v=Xp3VeBj4P-8, is decades in the making with a growing number of patrons and programs.
In the past 5 years, Analemma Society has worked with more than 18,000 visitors at Observatory Park. Analemma Society volunteers donate more than 1,800 volunteer hours per year, fundraise for telescope purchases and maintain scientific equipment, as well as provide education and programs and festivals that teach science, technology, engineering and math through astronomy at Observatory Park in Great Falls, Virginia.
This year's ceremony featured a tribute to the vision and years of dedication of Analemma Society late founder Charles Olin https://www.fairfaxcounty.gov/parks/awards/ellydoyle. Fairfax County Park Authority Dranesville district representatives Timothy Hackman presented the Harold Strickland Award to Christina Tyler Wenks, who accepted the award for Analemma Society and was also named an outstanding volunteer. The award was given to Charles's wife, Jacqueline Olin, as the couple founded Analemma Society and Observatory Park together.
More information about the Elly Doyle Awards and recipients may be found at https://www.fairfaxcounty.gov/parks/awards/ellydoyle. These videos were produced by Fairfax County Channel 16 and are shared with permission in celebration of the work of the many Analemma Society volunteers.
Passing of Analemma Founder Charles Olin
We are sad to report that after a period of ill health, Charles Olin, founding president of the Analemma Society passed away Tuesday night, March 28th, 2023. Without his vision there would be no Observatory Park. Charles and Jacque Olin were a powerful team that time and again accomplished things that seemed impossible. From a field of grass on the old Defense Mapping Agency and Nike site at Turner Farm, the concrete brick tower has become the Remote Astronomical Telescope Observatory (RATO), the dedication of a sundial garden, and through the Fairfax County Park Authority and a generous grant from the Edlemann's, we now have the Roll-Top Observatory and educational center.. Photo at right: Jacque and Charles Olin in front of the RATO, taken by TR Cook in 2013.
A memorial service was held at Observatory Park, Turner Farm in Great Falls, VA. for Charles on Sunday, May 21, 2023.
CHARLES H. OLIN (1933-2023)
Charles H. Olin was born in Niagara Falls to West Point Grad. Col. Charles L. Olin and Jeanette A. Olin. In youth he developed passions for arts, astronomy, and travel, crossing the ocean via ocean liner many times.
Charles received a B.S. in physics at Dickinson College, where he met his wife, Jacqueline: married in 1955. Charles was commissioned into the Marine Corps as a second lieutenant, studying advanced weaponry systems, leading tank maneuvers, and serving in the honor guard at 8th and I Marine Barracks, rising to the rank of captain.
Charles attended graduate school in Fine Arts at Cornell University, and then became one of the first students to attend the Art Conservation Center at New York University, Institute of Fine Arts. Charles was invited by the Smithsonian Institution to establish and develop multiple Conservation Programs for the Smithsonian. He was founder of the U.S. National Museum’s Conservation Analytical Laboratory (now the Museum Conservation Institute), The National Collection of Fine Arts Conservation Lab (now the Smithsonian American Art Museum Lunder Center), and the Conservation Lab at the National Portrait Gallery.
At the Smithsonian, Charles was responsible for conserving exhibits for two Museum openings, establishing analytical processes, and developing programs for training future conservators. He was among the founding members and a Fellow of the American Institute for Conservation.
After working at the Smithsonian Charles established a private conservation studio in Great Falls, VA: Olin Conservation, Inc. Charles’ company continues to serve numerous private, institutional, and museum clients across the country. During his own work in the private sector, Charles continued to train conservators, including a number of well-respected conservators in the field today. One of these is his son David. Charles was responsible for the conservation of innumerable works, including Renoir’s “Luncheon of the Boating Party”.
Charles considered his work in art conservation a "profession", rather than a "business." The key to his approach was observation, understanding, and attention to detail. These qualities were present in his lifelong passions. The study of science, specifically physics and astronomy, was omnipresent in every aspect of Charles's life. He was an avid gardener, naturalist, and he enjoyed the edible bounty of natural plants and wild game. Charles was a dedicated bow hunter and trapper. His love of classical music and opera was well known. Charles led championship teams with the Washington Area Dart Association and made wine from local vineyards. He enjoyed cooking. Charles was an accomplished sailor, including blue water adventures in his Hinckley Pilot 35, Betelgeux.
In Great Falls, VA, Charles became an EMT with the Great Falls Volunteer Fire Department. He was also the founding president of the Analemma Society at Observatory Park.
Survivors include wife, Jacqueline S. Olin, daughter, Dr. Deborah Norris, son David Olin, granddaughters Jessie Taylor and Jacqueline Hernandez, grandson Jon H. Norris, great-granddaughters Avery and Livia Taylor, and great-grandson Monte Taylor.
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