Astrophotography – How exactly timed DSLR shot?

I would like to know the exact UTC time for the moment the trigger is pressed. A millisecond accuracy would be ideal, but anything better than 1 second is acceptable.

The details of the photo properties are not accurate enough. The reported time is at best in UTC minutes.

Is there a delay between clicking the shutter button and opening the shutter button? Yes obviously, but how much? and does it depend on the shutter speed and something else?

I launch satellite passes in the night sky, with the ultimate goal of orbit determination. Precision is very important! | 522: Connection timed out

What happened?

The initial connection between the Cloudflare network and the originating web server has expired. Therefore, the web page can not be displayed.

What can I do?

If you are a visitor to this website:

Please try again in a few minutes.

If you are the owner of this website:

Contact your hosting provider to let them know that your web server does not meet any requirements. An error 522 means that the request was able to connect to your web server, but the request was not completed. The most likely cause is that something on your server is depleting resources. More troubleshooting information here.

Timed tasks

I'm something of an expert on programming, etc., and I've been hiring programmers to make sites historical for me. My current program … | Read the rest of

Trace Route – request timed out


I'm not familiar with CMD, Ping and Tracert.

This is only the case for certain websites. I can access the website, but I always get error_time_out from Chrome.
I need to brush chrome 2-3 times to get there.

With the Tracert I get this result below. Can someone tell me what these results mean?


  1 <1 ms <1 ms <1 ms
2 * * * Request timed out.
3 * * * Request timed out.
4 * * * Request timed out.
5 * * * Request timed out.
6 * * * Request timed out.
7 * * * Request timed out.
8 * * * Request timed out.
9 * * * Request timed out.
10 * * * Request timed out.
11 * * * Request timed out.
12 * * * Request timed out.
13 * * * Request timed out.
14 * * * Request timed out.
15 * * * Request timed out.
16 * * * Request timed out.
17 * * * Request timed out.
18 * * * Request timed out.
19 * * * Request timed out.
20 * * * Request timed out.
21 * * * Request timed out.
22 * * * Request timed out.
23 * * * Request timed out.
24 * * * Request timed out.
25 * * * Request timed out.
26 * * * Request timed out.
27 * * * Request timed out.
28 * * * Request timed out.
29 * * * Request timed out.
30 * * * Request timed out.

Trace completely.

Thanks for any help

Approach to timed events in a frame-like library – a matter of life (cycle) and death

I am working on an auxiliary library that should send data to a server at a certain interval, eg. 1 minute.

The idea is that the user of this library does not have to deal with inserting the event handlers, disposing, etc. Regardless of which app it uses, the help library should look after the app data, search for files, and post a server once a minute.

The library should send telemetry data to the server. A developer in the code states when to send some of the data – but I do not want to send it in this instance. Instead, I want to stack the requests and send them in an interval. Therefore, the data is first stored locally and sent to the server later.

I was thinking about using System.Timers.Timer for the job, but …
If the parent app quits or crashes, the timer is still there, triggering it On_Elapsed Event.

How would you implement this kind of functionality? Maybe something other than a timer?

The goals:

  • Null / minimal configuration for the developer using this framework
  • Send data stacked from time to time and not as soon as data is displayed
  • The application should specify an instance of a telemetry client class. However, more than one instance or more than one instance may be specified. I do not want dozens of timers running in the background.