Hacker News: jonaslanglotz

New comment by jonaslanglotz in "Missile defense is NP-complete"

jonaslanglotz — Tue, 24 Mar 2026 13:57:56 +0000

Calling a Fattah hypersonic is a misleading claim. It is simply a ballistic missile that reaches hypersonic speeds, which is different from a true hypersonic weapon in its flight path and ability to maneuver. This distinction is important because it makes it significantly easier to shoot down than something like a hypersonic glide vehicle or hypersonic cruise missile.

But I agree with your point that it does remain difficult to intercept and poses the shot-exchange problem.

New comment by jonaslanglotz in "Ask HN: What is thick black row above top of header?"

jonaslanglotz — Wed, 11 Mar 2026 07:00:28 +0000

It's digital mourning stationery [1] in memory of Tony Hoare [2].

[1] https://en.wikipedia.org/wiki/Mourning_stationery [2] https://news.ycombinator.com/item?id=47324054

New comment by jonaslanglotz in "Ask HN: What Are You Working On? (March 2026)"

jonaslanglotz — Mon, 09 Mar 2026 10:19:17 +0000

I'm working on site that let's you check when a manned space station was last directly over your house.

It's a reference to https://xkcd.com/2883/, which I've always liked and was suprised there was no tool to check when you last had astronauts over for dinner.

Looking up the location of the ISS at a specific time is easy. Looking up the closest passes of the ISS to a specific location for the last 30 years on-demand is more complicated.