Hacker News

New stories

Live mirror
30 storiesupdated just nowView source snapshot
  1. A Quick Guide on Creating a Design System (andrewcoyle.com)
    —discuss
  2. Free Space Bunny Model playground, no signup (spacebunnymodel.com)
    1comments
  3. Locked out: Why young Europeans can't afford to buy homes (euronews.com)
    —discuss
  4. Washington Challenges Brussels' Authority over X (reclaimthenet.org)
    —discuss
  5. Five Million Robots Now Operate in Factories Globally (ifr.org)
    —discuss
  6. Advice to a Beginning Software Engineer (seangoedecke.com)
    —discuss
  7. SpaceX Pivots Away from Space (ft.com)
    1comments
  8. Diagnosing and Mitigating Tool-Call Repetition in MiMo-v2.6 (xiaomi.com)
    —discuss
  9. 3D necroprinting: Leveraging biotic material as the nozzle for 3D printing (science.org)
    —discuss
  10. How many strings can you create per second? (lemire.me)
    —discuss
  11. VevDB (vevdb.com)
    1comments
  12. Show HN: Vanish moves heavy computation off your laptop (vanishcompute.com)
    1comments
  13. Machine Learning Systems (mlsysbook.ai)
    —discuss
  14. Eyes on Asteroids (NASA) (nasa.gov)
    —discuss
  15. My Ansible Plugin Had a Jail Escape: CVE-2026-55074 (hofstede.it)
    —discuss
  16. Why Retail Stores are closing across America in 2026 (youtube.com)
    —discuss
  17. George Hotz’s opinion on AI coding (twitter.com/__tinygrad__)
    2comments
  18. Save Your Time with These Agentic RAG Patterns (medium.com/zikozero011)
    1comments
  19. Thieves steal Nvidia-labeled trailers – yields 20 tons of sand (tomshardware.com)
    —discuss
  20. AI Has Cracked the Most Diabolical Problems in Math. Why Can't It Solve Chess? (wsj.com)
    2comments
  21. Show HN: ShotCandy – Turn any screenshot into a beautiful share-ready image (github.com/btahir)
    —discuss
  22. Latency reduction for consumer facing AI applications
    —discuss
  23. Show HN: InkVec Studio – In-browser, SOTA, WASM based (rust) vectorizer (hf.space)
    —discuss
  24. Fundamentals still worth learning when AI writes the code (flaviocopes.com)
    —discuss
  25. A thesis isn't enough for a PhD (lemire.me)
    —discuss
  26. How fast can you fix a UTF-16 string in C#? (lemire.me)
    —discuss
  27. NAND-16: a computer built from 277,248 NAND gates (somethingbig.ai)
    —discuss
  28. T3rnel Browser – DevTools you can talk to, and a browser your AI can drive (t3ratech.github.io)
    —discuss
  29. Neo – Hugh Howey (hughhowey.com)
    1comments
  30. Show HN: Jev-Like Model Learns to Cook (rlafuente.com)
    —discuss

Lunar Terminator Paradox

19 pointsby 1h agonotes.secretsauce.net
4 comments
20m agoHN ↗

Now, what happens if the moon is not at the horizon, but higher up at the sky?

Moon follows the sun to the west so to move moon "higher" up in the sky you need to rewind time (15deg/hour). In e.g. 4 hours moon barely moves in it's 28 day cycle so the moon will look exactly the same (you can take a picture and compare). It's the earth rotation that make moon "go down" or up. I've read your article 2 times and I still don't understand what is apparent problem, no wonder AI had trouble. Also it's hard to reason about up and down when moon move along ecliptic which is curve. Down at noon points elsewhere as down at sunset.

18m agoHN ↗

is this a bad moment to mention how weird it is that the moon is perfectly positioned to create eclipses?

I think its pretty incomprehensible odds if you ask google.

But I could be wrong I know literally nothing about astronomy, it just always surprised me its not common, but it be cool if someone could explain that

14m agoHN ↗

it was my vague understanding that what is weird is the apparent size matching. since the moon is slowly moving away, eventually we'll no longer have total solar eclipses, just annular and partial.

13m agoHN ↗

The sky is spherical, so straight lines in the sky aren’t straight lines on its 2D projection on the retina. Rather, straight lines are great circles. So if you trace the great circle that connects the sun and the moon, the moon should "point" along that great circle – which can be considerably off of what we think of as a straight line (which is curved in reality).