Rose City Astronomers (RCA)
Providing Astronomy Community for the Portland Metro Area
The RCA November General meeting date has changed to Monday, November 27th, and it will be special. OMSI Director of Space Science Education Jim Todd will be giving us a personal, behind-the-scenes tour of the newly remodeled and updated OMSI Planetarium. The program will include a complete showing of one of the one of the professionally-produced shows currently running. It should be a lot of fun. The change of date is caused by a street closure and interruption of electrical service on our usual meeting night.
New members are welcome to meet in the OMSI Planetarium at 6:30 before the General Meeting for an orientation and introduction to Rose City Astronomers.
Join us at noon on the first Fridays of every month for good conversation and good food at McMenamin’s on Broadway, 1504 NE Broadway, Portland. Everyone is welcome!
If you need help with a telescope project, need to clean or align your optics, or just want to talk about telescopes, come to the workshop. Activities include telescope building from scratch or a kit, telescope setup, cleaning, aligning, adjustment, and help using your telescope.
To inform, inspire and keep up to date on current research and the state of our knowledge of the universe. This SIG meets in a private home so the address is not published on our website. Our Cosmology SIG leader can be reached through the Contacts page for more information.
Whether you're a beginner, intermediate or advanced astro-imager — whether you're using a CCD, DSLR, point-and-shoot or film camera — this group can help you achieve better images with less effort and frustrations.
Slides from Our General Meeting
By RCA Member Charles Fichter
I had the luxury this past year to get out and explore Eastern Oregon and Nevada for observing locations. My extended family lives in Las Vegas, so I made several trips by vehicle and hauled the gear and tents with me to see what I could find, and I purposely diverted further Eastward in Oregon to have a look at a few spots. I was rewarded with several great locations for adventurers with time and hunger to get to really dark skies. Other unexpected treats were in store as well.
The Milankovitch theory identified three aspects of Earth’s orbital motion as causes of the Ice Age glacial periods and the cyclical long term climate change: (1) the changing shape of Earth’s orbit from more circular to more elliptical; (2) cyclical changes in the “tilt” of Earth’s axis of rotation (axial tilt and precession) which affect the amount of solar radiation received by each hemisphere; and (3) the first two aspects acting together to determine where along Earth’s orbit maximum and minimum levels of solar radiation are received. These orbital cycles have always affected Earth’s climate by controlling the amount of solar radiation reaching Earth.
Once again, I’ve received an email from a member of the public with a heart-rending story. Someone has purchased a star name as a gift to someone they love, or in remembrance of someone who has passed away. They write to me to say they can’t find that star and ask me how to find it. Then once again I am tasked with informing a loving and well-meaning person that they’ve been scammed.