Recent content by glappkaeft
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Our Beautiful Universe - Photos and Videos
IIRC those match the sunspots recorded that day. I looked it up that day using https://www.spaceweather.com and those are the locations I remember (the site don't have historical data).- glappkaeft
- Post #2,313
- Forum: Astronomy and Astrophysics
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Stargazing Q: Meridian flip
Never heard any other mount do that so if it not limited to Losmandy mounts then at least not a common limitation.- glappkaeft
- Post #3
- Forum: Astronomy and Astrophysics
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Space Stuff and Launch Info
I saw a upper stage venting while trying out a new telescope mount. Got this images using my phone. I think this is the Space X NROL-69 launch. The time was pretty much 19:00 UTC and it launched 17:48. Location was outside Linköping, Sweden.- glappkaeft
- Post #1,483
- Forum: Aerospace Engineering
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Our Beautiful Universe - Photos and Videos
Some one day late New Years fireworks from Sundsvall, Sweden. All images are 4 second exposures on a tripod, with a Canon EF 14mm f/2.8 L USM II lens at f/4, on a Canon 5D mk IV using ISO3200.- glappkaeft
- Post #2,288
- Forum: Astronomy and Astrophysics
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What are the odds?
No, one is the only value that would cause a miss in this case and 2 or more would result in a hit so they would be equally good. The expected value from launching 12 of those missiles is 10 hits, he got none.- glappkaeft
- Post #22
- Forum: General Discussion
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What are the odds?
If it wasn't for the fact that there where many of us there that remembers it, yes.- glappkaeft
- Post #17
- Forum: General Discussion
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What are the odds?
I once walk up to a miniature gaming table just as a friend launched 12 missiles of some sort from his Warhammer 40K figures (Space Marine Dreadnoughts/Terminators/something like that, I don't play WH40K). The missiles hit on 2 or more on a six-sided die and he rolled 12 dice in one go and all...- glappkaeft
- Post #15
- Forum: General Discussion
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Could a nuclear powered rocket be safely launched from Earth?
Only this prototype that was build by General Atomics and tested in 1959 using conventional explosives. https://airandspace.si.edu/collection-objects/propulsion-test-vehicle-project-orion/nasm_A19721008000- glappkaeft
- Post #18
- Forum: Aerospace Engineering
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Could a nuclear powered rocket be safely launched from Earth?
Another issue is that the 500-1000 nuclear bombs the different Orion concepts used would be a new kind of expensive. The concept as based on the availability of small cheap fusion bombs without a fission starter that would soon be invented. 60 years later they still don't exist.- glappkaeft
- Post #7
- Forum: Aerospace Engineering
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Our Beautiful Universe - Photos and Videos
Quick stack and edit of comet C/2023 A3 (Tsuchinshan-ATLAS) shot using a simple tripod from earlier tonight (CET). 11 individual 6s exposures with 70 mm focal length (Canon 70-200mm F4L @ F/5.6 and a Canon 5D mk III @ ISO 6400). Note the faint anti-tail and globular cluster Messier 5 (fuzzy spot...- glappkaeft
- Post #2,262
- Forum: Astronomy and Astrophysics
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Thermal effects in aircraft engines - sudden/rapid cooling
I believe that this is usually called leasing. ;) Which is a common thing when it comes to aircraft engines.- glappkaeft
- Post #8
- Forum: Aerospace Engineering
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Crowdstrike debacle for Microsoft Windows Update
Why would that help? Crowdstrike is a not a Microsoft product. It is a separate publicly traded company.- glappkaeft
- Post #30
- Forum: Computing and Technology
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Boeing Keep your seatbelt low and tight in flight, especially when seated next to a plugged door
Having an engineer as a CEO is no panacea. The CEOs when Boeing moved the HQ to Chicago, merged with McDonald Douglas and made a lot of questionable decisions was Philip Condit (Master and PHD in Aeronautical Engineering) and Harry Stonecipher (BA in Physics). The CEO during the 737 Max fiasco...- glappkaeft
- Post #206
- Forum: Aerospace Engineering
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I Any Galaxy (Milky-way) based coordinate systems?
Also we know with pretty high precision where the sun is. The location of the center of the galaxy has very wide error bars (+- 0.8 kpc from Reid et al 2009, ApJ, 705, 1548) so it is pretty useless as the center for calculations.- glappkaeft
- Post #5
- Forum: Astronomy and Astrophysics
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I Very bright geo satellite in my night sky?
No, Jupiter can be seen before sun rise in southern Germany right now. Edit: also Mars and, out of frame, to the right Saturn.- glappkaeft
- Post #25
- Forum: Astronomy and Astrophysics