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Precision Clock Mk IV

https://mitxela.com/projects/precision_clock_mk_iv
233•ahlCVA•4h ago•76 comments

A Lean companion to Analysis I

https://terrytao.wordpress.com/2025/05/31/a-lean-companion-to-analysis-i/
94•jeremyscanvic•2h ago•6 comments

Oxfordshire clock still keeping village on time after 500 years

https://www.bbc.com/news/articles/cz70p0qevlro
61•1659447091•2d ago•27 comments

We're beating $359M in funding with two people and OCaml

https://terrateam.io/blog/punching-above-weight
16•imadj•41m ago•2 comments

Show HN: PunchCard Key Backup

https://github.com/volution/punchcard-key-backup
61•ciprian_craciun•3h ago•23 comments

Photos taken inside musical instruments

https://www.dpreview.com/photography/5400934096/probe-lenses-and-focus-stacking-the-secrets-to-incredible-photos-taken-inside-instruments
895•worik•23h ago•46 comments

AtomVM, the Erlang virtual machine for IoT devices

https://www.atomvm.net/
130•ahamez•3d ago•39 comments

The Two Ideals of Fields

https://susam.net/two-ideals-of-fields.html
35•susam•5h ago•17 comments

Using Ed(1) as My Static Site Generator

https://aartaka.me/this-post-is-ed.html
38•BoingBoomTschak•5h ago•15 comments

Designing Pareto-optimal RAG workflows with syftr

https://www.datarobot.com/blog/pareto-optimized-ai-workflows-syftr/
27•roma_glushko•3d ago•7 comments

Show HN: Fontofweb – Discover Fonts Used on a Website or Websites Using Font(s)

https://fontofweb.com
34•sim04ful•5h ago•18 comments

AI video you can watch and interact with, in real-time

https://experience.odyssey.world
79•olivercameron•3d ago•27 comments

Beware of Fast-Math

https://simonbyrne.github.io/notes/fastmath/
254•blobcode•12h ago•171 comments

Using lots of little tools to aggressively reject the bots

https://lambdacreate.com/posts/68
117•archargelod•11h ago•57 comments

Gradients Are the New Intervals

https://www.mattkeeter.com/blog/2025-05-14-gradients/
112•surprisetalk•13h ago•41 comments

Acclimation of Osmoregulatory Function in Salmon

https://www.unm.edu/~toolson/salmon_osmoregulation.html
16•mooreds•5h ago•3 comments

Webb telescope helps refines Hubble constant, suggesting resolution rate debate

https://phys.org/news/2025-05-webb-telescope-refines-hubble-constant.html
76•pseudolus•3d ago•40 comments

Atlas: Learning to Optimally Memorize the Context at Test Time

https://arxiv.org/abs/2505.23735
13•og_kalu•5h ago•0 comments

Surprisingly fast AI-generated kernels we didn't mean to publish yet

https://crfm.stanford.edu/2025/05/28/fast-kernels.html
354•mfiguiere•23h ago•149 comments

Show HN: AI Peer Reviewer – Multiagent System for Scientific Manuscript Analysis

https://github.com/robertjakob/rigorous
75•rjakob•5h ago•65 comments

Show HN: I built an AI agent that turns ROS 2's turtlesim into a digital artist

https://github.com/Yutarop/turtlesim_agent
23•ponta17•9h ago•6 comments

The Illusion of Causality in Charts

https://filwd.substack.com/p/the-illusion-of-causality-in-charts
34•skadamat•3d ago•18 comments

Exploring a Language Runtime with Bpftrace

https://www.mgaudet.ca/technical/2025/5/28/exploring-a-language-runtime-with-bpftrace
5•mgaudet•3d ago•0 comments

The ‘white-collar bloodbath’ is all part of the AI hype machine

https://www.cnn.com/2025/05/30/business/anthropic-amodei-ai-jobs-nightcap
554•lwo32k•1d ago•999 comments

The Trackers and SDKs in ChatGPT, Claude, Grok and Perplexity

https://jamesoclaire.com/2025/05/31/the-trackers-and-sdks-in-chatgpt-claude-grok-and-perplexity/
58•ddxv•11h ago•2 comments

C++ to Rust Phrasebook

https://cel.cs.brown.edu/crp/
171•wcrichton•21h ago•57 comments

Beating Google's kernelCTF PoW using AVX512

https://anemato.de/blog/kctf-vdf
316•anematode•1d ago•91 comments

Microsandbox: Virtual Machines that feel and perform like containers

https://github.com/microsandbox/microsandbox
353•makeboss•1d ago•169 comments

Revenge of the Chickenized Reverse-Centaurs

https://pluralistic.net/2022/04/17/revenge-of-the-chickenized-reverse-centaurs/
159•GreenWatermelon•3d ago•89 comments

Show HN: Icepi Zero – The FPGA Raspberry Pi Zero Equivalent

https://github.com/cheyao/icepi-zero
214•Cyao•3d ago•50 comments
Open in hackernews

Radio Astronomy Software Defined Radio (Rasdr)

https://radio-astronomy.org/rasdr
129•zeristor•1d ago

Comments

Alpi•1d ago
Anybody has experience using rasdr4? What is it capable of?
0xEF•1d ago
It's a bit niche in the radio hobby, but very cool. That said, it is marketed to a very specific type of radio hobbyist which is probably best explained by looking at the first few sections of the manual, specifically around section 2a if you want to get a better sense of who this is for

User Manual: https://rasdr.org/release/1.2.4/RASDR-Users-manual-v1.7.5.pd...

SiempreViernes•1d ago
I feel like 2a just says "It's for radio astronomy", is that what you mean?
0xEF•1d ago
Sort of. We have to understand what a SARA project is, how and where DSP would be employed, etc...hence why I mentioned its pretty niche. Radio astronomy, from my outsider understanding, is not something a newbie just walks in the door and picks up on. You have to have some experience with typical SDR use, data collection, etc.
pfdietz•1d ago
> Radio astronomy, from my outsider understanding, is not something a newbie just walks in the door and picks up on.

Unless you're Grote Reber.

https://en.wikipedia.org/wiki/Grote_Reber

lotrjohn•19h ago
Awesome read. Ty for sharing.

>For nearly a decade he was the world's only radio astronomer.

teleforce•1d ago
Great stuff, imagine doing radio astronomy with this more capable RFSoC SDR platform with 50% discount for academics at around USD2K [1]. It also has free textbook to go with it [2].

[1] RFSoC 4x2 Kit:

https://www.amd.com/en/corporate/university-program/aup-boar...

[2] RFSoC book:

https://www.rfsocbook.com/

westurner•6h ago
Are there Rydberg antenna SDRs for radio astronomy?

What sensitivity (?) is necessary to navigate by the EMF of stars?

FWIU this is called astronometry? There's probably a better word than "astral"?:

From https://news.ycombinator.com/item?id=44054783 :

> How many astral signals does a receiver need to fix to determine lat/long/altitude given the current time?

> How many astral signals does a receiver need to fix to determine to infer the current time, given geometrically-impossible triangulation and trilateration solutions given the known geometry of the cosmos and the spherical shape of the earth?