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RASC Calgary Centre

@calgaryrasc.bsky.social

Calgary Centre of The Royal Astronomical Society of Canada, Inspiring Interest & Knowledge in Astronomy since 1958! https://linktr.ee/calgaryrasc

1092 Posts1341 Follower154 Folgt
Старый Ворон/Old Raven@oldvalravn.bsky.social · 2d ago

🔭 «Самая сложная фотография глубокого космоса, которую я когда-либо делал: 350-часовая экспозиция, показывающая галактику Андромеды и Млечный путь» – делится Эндрю МакКарти Это 248-мегапиксельное изображение было создано на основе более чем терабайта данных, собранных в течение года.

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Sara Pritchard@sarabpritchard.bsky.social · 3d ago

@maxliboiron.bsky.social kindly invited me to write a Discard Studies blog post about the article. #LightPoverty and #LightJustice ✊🏼✊🏽✊🏾 are central to my forthcoming book, #TransformingNight 🌌🌃 #LightPollution #ArtificialLight #ALAN #Darkness #Night discardstudies.com/2017/06/12/o...

On (not) seeing artificial light at night: Light pollution or lighting poverty?

By Dr. Sara B. Pritchard Department of Science & Technology Studies, Cornell University So it began. This was the image that sparked my interest in light pollution and light-pollution science (…

discardstudies.com

Canadian History Ehx@cdnhistoryehx.bsky.social · 5d ago

On this day in 1905, Helen Sawyer Hogg was born. As an astronomer, she pioneered research into globular clusters and variable stars. She also inspired many to pursue science through her Toronto Star column With the Stars, that ran from 1951 to 1981. 📸 University of Toronto

Helen Sawyer Hogg standing beside a large telescope inside an observatory. She is holding papers and looking upward with a slight smile. The black-and-white photograph emphasizes the scale of the telescope above and behind her, with the observatory interior visible in the background.
RASC Calgary Centre@calgaryrasc.bsky.social · 6d ago

Many #astronomy groups, such as ourselves, have noticed this effect when people change their RSVP to star parties in response to a future prediction of clouds or rain. In reality, we almost always have observing weather during the event itself.

Tom Gill@tomgillpredicts.bsky.social · 6d ago

A hot take from me. Weather apps are a bane to society. They're generally inaccurate, and people don't understand how they work anyway. And this article points out how they are hurting the economy. www.businessinsider.com/weather-apps...

Gregor Kalinkat@gkalinkat.bsky.social · 7d ago

🚨 Open position in the light pollution 💡 lab of Franz Hölker at @igb-berlin.de 🧪 GIS Scientist (m/f/x) – measuring and mapping nocturnal lightscapes 👩‍💻 (fixed-term contract until 06/2029, DL for applications 2026/09/14) karriere-igb.softgarden.io/job/66383633...

GIS Scientist (m/f/x) – measuring and mapping nocturnal lightscapes at Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB) im Forschungsverbund Berlin e.V.

We're looking for: GIS Scientist (m/f/x) – measuring and mapping nocturnal lightscapes (Part Time) • Müggelseedamm, 12587 Berlin-Bezirk Treptow-Köpenick, Deutschland

karriere-igb.softgarden.io

bookswain.bsky.social@bookswain.bsky.social · last wk.

Betelgeuse in Orion. The α next to it is its designation (Alpha Orionis) that Johann Bayer gave it in 1603. Betelgeuse is from a European translation error of the Arabic “the hand of al-Jawzā.” Another binary star, Sirius the Dog Star, purposely included in view from my copy of an 1856 star atlas.

Detail of a page from An astronomical atlas focused on the constellation Orion, depicted as an ancient warrior. 🔭
ESO@eso.org · last wk.

The conclusion of a century-long quest 😲 Our VLT obtained firm evidence that Betelgeuse, a red supergiant star in the Orion constellation and one of the most famous stars in the night sky, is not alone! 🔭 🧪 1/4

A collage of various astronomical images. The background image shows a wide view of a starry night sky, with blue lines connecting the stars of the Orion constellation. An inset image zooms into the star Betelgeuse, showing its orange surface. A second inset shows a bright companion next to the star. Image by ESO/M. Montargès et al. Background: N. Rissinger (skysurvey.org).
bookswain.bsky.social@bookswain.bsky.social · last wk.

“And yet it moves.” The cover of my 1856 copy of the atlas for Burritt’s Geography of the Heavens with a fanciful illustration of Galileo and his famous quote that is almost certainly apocryphal. Another 🧵, because the constellationplates are definitely worth a look.

The cover is an oversized atlas. The decor is blue, there is a sketch illustration of Galileo in front of a globe surrounded by a thoughtful group. Something like that. #sciart #astronomy #astrology #zodiac #constellations
bookswain.bsky.social@bookswain.bsky.social · last wk.

One more, David Rittenhouse’s observations of the Comet of 1770, aka Lexell's Comet, in my 1789 copy of Transactions of the American Philosophical Society. Rittenhouse assumed a parabolic trajectory. The club shaped paperweight was formerly part of an MRAP destroyed by an IED (3/n) ☄️

A fold out illustration of observations of a ☄️ On the left is a figure representing the ecliptic and horizon and the comet’s apparent path. On the left is a diagram of the Conet’s parabolic path around the sun. #astronomy #comets #histsci #sciart
Alan Dyer@amazingskyguy.bsky.social · last wk.

Here are two versions, with and without labels, of a nightscape scene along the Icefields Parkway in Jasper National Park, Alberta, at the Athabasca Pass Viewpoint. This was from July 16 before the smoke moved in! Tech details are in the Alt Text.

Technical: This is a complex blend of separate exposures for ground and sky: - A stack of 2 x 2 minutes at ISO 800, untracked, for the ground, with LENR on, followed immediately by ... - A stack of 4 x 1 minute at ISO 800, tracked, with no filter and LENR off, for the sky, followed by ... - A stack of 2 x 1 minute at ISO 800, also tracked, with the Maven StarWalker filter to add the star glows, followed by ... - A stack of 3 x 2 minutes at ISO 1600, also tracked, with the Maven 20nm red Hydrogen-Alpha filter for the nebulas. Stars were removed from the H-alpha layer with the RC-Astro Star XTerminator filter. All were with the astro-modified Canon Ra and Canon RF15-35mm lens at 26mm and f/2.8 and on the MSM Nomad star tracker. The foreground was not an evening "blue hour" shot. Taken close to 12:30 am MDT, it is lit just by starlight and the lingering perpetual twilight of a summer night. Technical: This is a complex blend of separate exposures for ground and sky: - A stack of 2 x 2 minutes at ISO 800, untracked, for the ground, with LENR on, followed immediately by ... - A stack of 4 x 1 minute at ISO 800, tracked, with no filter and LENR off, for the sky, followed by ... - A stack of 2 x 1 minute at ISO 800, also tracked, with the Maven StarWalker filter to add the star glows, followed by ... - A stack of 3 x 2 minutes at ISO 1600, also tracked, with the Maven 20nm red Hydrogen-Alpha filter for the nebulas. Stars were removed from the H-alpha layer with the RC-Astro Star XTerminator filter. All were with the astro-modified Canon Ra and Canon RF15-35mm lens at 26mm and f/2.8 and on the MSM Nomad star tracker. The foreground was not an evening "blue hour" shot. Taken close to 12:30 am MDT, it is lit just by starlight and the lingering perpetual twilight of a summer night.
bookswain.bsky.social@bookswain.bsky.social · last wk.

“Take Cₛ to represent the disturbing force of the moon, and make Cₛ to CS as the force of the moon to that of the sun.” I think mathematics is capable of producing sciart. If not art, it’s at least aesthetically pleasing. My copy of Dobson’s 1798 encyclopedia, the first published in the U.S. 📚 🧮

A page with circular geometric figures used to illustrate proofs on an 18th century encyclopedia chapter on tides. #booksky #maths #histmath
bookswain.bsky.social@bookswain.bsky.social · 2w ago

Haeckel was going to be my next historical scientific art thread. Here’s one anyway, labeled ‘Chaetopoda’, an archaic taxonomy for marine annelid worms that have chaetae, or bristles. Plate from his 1904 ‘Kunstformen der Natur’ 🌊 🦑 🪱

bookswain.bsky.social@bookswain.bsky.social · 2w ago

“Mond-Oberfläche unter voller Beleuchtung” (Lunar surface under full illumination). My copy of a map published by Justus Perthes in 1872 based on the pioneering lunar cartography of Wilhelm Beer & Johann Mädler. The nail is pointing at the Apollo 11 landing site (0° 41' 15" N, 23° 26'00" E) 🌔 🔭

A detailed lunar map of the hemisphere visible from earth. Latitude and longitude lines are annotated and mare are named. #moon #fullmoon #astronomy #histsci #sciart #spaceflight #nasa