NTP
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06dcd755b2
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5b081cd340
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@ -435,3 +435,4 @@
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% PPS (gps)
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% PPS (gps)
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% gpsd
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% gpsd
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% List of Software ?
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% List of Software ?
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% NTP
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@ -416,9 +416,24 @@ When mount control is functioning, a location on the sky chart, such as a star,
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can be clicked on and the mount will go to that location and optionally track it.
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can be clicked on and the mount will go to that location and optionally track it.
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Using this, a telescope mount can be used to easily point the camera at a location
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Using this, a telescope mount can be used to easily point the camera at a location
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and track it to observe telescopes. It should also provide a superior \gls{FITS} file
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and track it to observe telescopes. It should also provide a superior \gls{FITS} file
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for extracting data (XXX made up).
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for extracting data than using a static mount (XXX made up).
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\index{KStars}\index{sky chart}\index{GOTO}\index{mount}\index{track}
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\index{KStars}\index{sky chart}\index{GOTO}\index{mount}\index{track}
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To fully set up a telescope tracking mount, the following steps need to be performed in
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roughly this order:
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\begin{mdframed}[backgroundcolor=blue!10,linecolor=blue!30]
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\begin{enumerate}
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\item Physically mount all hardware.
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\item Plug in and power everything up.
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\item Confirm all hardware looks ok (e.g. \texttt{lsusb}).
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\item Confirm GNSS time and location are ok (e.g. \texttt{cgps -u m}).
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\item Conr
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\end{enumerate}
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\end{mdframed}
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\index{mount}\index{KStars}\index{telescope}\index{track}
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\index{lsusb}\index{cgps}\index{GNSS}
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\begin{sidewaysfigure}[p!]
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\begin{sidewaysfigure}[p!]
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\begin{center}
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\begin{center}
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\includegraphics[keepaspectratio=true,height=1.00\textheight,width=1.00\textwidth,angle=0]{kstars-skychart.png}
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\includegraphics[keepaspectratio=true,height=1.00\textheight,width=1.00\textwidth,angle=0]{kstars-skychart.png}
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@ -570,3 +585,42 @@ See below for sample output from \texttt{cgps}.
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\end{minted}
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\end{minted}
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\index{cgps}
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\index{cgps}
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\section{NTP}
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\label{sec:software-ntp}
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\index{NTP}
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With all the above, time still needs to be configured.
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Configuring \texttt{gpsd} isn't enough for correct system time.
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The main system on the Internet used for time synchronization is NTP.
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In \gls{Debian} there are a few options for NTP.
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The best is to use a hardware GPS, with PPS for improved
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accuracy. The easiest is to just use NTP.
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\index{PPS}
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All systems in the chain need to have the correct time and
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location. It is best if they all pull from the same NTP
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server, or even better than best if they all run \gls{GNSS}
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hardware with PPS enabled.
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Some quick and dirty time synchronization commands.
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The \texttt{ntpd} daemon can have slow startup synchronization
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sometimes. If so, perhaps run like this:
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\begin{minted}{sh}
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# Get the daemon out of the way.
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sudo systemctl stop ntp
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# Get time from someone, MIT in this case:
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sudo ntpdate time.mit.edu
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# OR
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# Get time from local server, such as router (made up IP):
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sudo ntpdate 192.168.1.1
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# Restart daemon
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sudo systemctl start ntp
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\end{minted}
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Go through each of the systems used in the toolchain and make
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sure they all have accurate time or everything will be off.
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