6 ms·
I understand there are API limitations, but isn't 15 minutes a lot for an object that orbits around the entire Earth in 90 minutes? On average you're going to b
by kmm 1y ago
I understand there are API limitations, but isn't 15 minutes a lot for an object that orbits around the entire Earth in 90 minutes? On average you're going to be off by about a twelfth of the circumference of the Earth, or roughly the distance between Lisbon and Istanbul
- edent 1y agoYes. As I say in the post, you shouldn't use this for docking operations. If you know of a DNS update which allows for per-minute updates for free, I'll happily move to it.
- AdieuToLogic 1y ago> As I say in the post, you shouldn't use this for docking operations. Brilliant. :-D
- fouronnes3 1y agoYou totally could use it for docking. A real ISS docking manoeuvre takes several hours. Orbits are very predictable and I'm quite confident that the error you'd get projecting your orbit 15min into the future would be good enough to get within close radar range for the final approach. In fact you probably could do it, even if your spavecraft doesnt have DNS at all, and you have to do the DNS resolve from a ground laptop before you board it. Soyez can dock within 3 hours of lauch. Orbits are very predictable in this timeframe.
- edent 1y agoI shall make the suggestion to NASA that they start using this ;-)
- 05 1y agoSure they're predictable, but since you don't get the exact timestamp for those expired coordinates, it's still useless. Oh, and accuracy is shit anyway (altitude is rounded to 10m)
- CobrastanJorji 1y agoIf there's no timestamp, all you know is a Lat/Long that was accurate sometime in the last 15 minutes (or more, "best effort basis"). But you don't know when, and you don't know the altitude. That's gonna make using that information for docking...difficult.
- Levitating 1y ago> If you know of a DNS update which allows for per-minute updates for free, I'll happily move to it. Why not setup your own name server?
- zdw 1y agoThis is the correct way - dynamic DNS servers frequently have very low TTLs set. Serving DNS yourself is such an incredibly small bandwidth impact - most of the packets are in the 10's to 100's of bytes - and authoritative DNS servers do not do a lot of processing, just send back RR's from zones which are read at boot time, or updated in an in-memory database.
- edent 1y agoI couldn't be bothered to set up a DNS server for such an ephemeral joke. But I would love to read your blog post about setting one up and what you learned.
- iwontberude 1y agoCoredns is so simple to configure and is a barebones container deployment.
- edent 1y agoCool! Please set it up and write a blog post about it. I'm not being snarky. I've never set up something like that and I'm sure lots of people would be happy to ready about it.
- hhh 1y agohi, i haven’t made a video but i have some stuff set up for it: https://youtu.be/AJ2Q12vYojY https://youtu.be/AJ2Q12vYojY https://youtu.be/GoPWuJR6Npc https://youtu.be/GoPWuJR6Npc and i host https://dnsroleplay.club https://dnsroleplay.club which lets you answer real people’s dns requests, there should be links to the github for how it’s done
- echoangle 1y ago> If you know of a DNS update which allows for per-minute updates for free, I'll happily move to it. Does Cloudflare not allow this?
- Abekkus 1y agoI'd say the API can take up to half a minute to propagate, so API updates every minute is running up against their own performance. If you're a free customer, they may block you after a while, but first they'd have to notice you, and I doubt one update per minute would bother them.
- metafunctor 1y agoIt’s quite easy to run your own DNS server — I've found it a worthwhile exercise. Of course, you’ll need a server to run it on.
- Abekkus 1y agoCloudflare does this with an API. If you have any money, I'd suggest dnsimple.com instead.
- dahsameer 1y ago> As I say in the post, you shouldn't use this for docking operations Remember people, DNS stands for "Definitely Not for Space-docking"
- llimos 1y agoor "Docking Not Supported"
- ethan_smith 1y agoAt orbital speed of ~7.66 km/s, the ISS travels approximately 6,900 km during a 15-minute interval, which is indeed significant for precise location tracking.