Use of PyEphem

[kramkroc]

Hi folks,

just wondering about the use of PyEphem in the Astro PI. The reading for the TLE is only valid for a period of time, so I wondered, in the depths of space (i.e. no network access) whether there was some way for an up to date reading to the supplied when a 3 hour program was to be kicked off?

Cheers in advance folks,

/Mark

[Davespice]

Hi Mark

I'll be explaining this during the webinar (which your teacher will get an email about soon). But basically if you get chosen for space-flight a few minor modifications are made to your code to make it obey the Astro Pi MCP (Master Control Program). As part of those edits, if I see your code is using hard coded two-line element telemetry lines I update it to load the telemetry from a shared location which is kept up to date by our ground station in Switzerland.

So you can expect to be able to computer accurate ISS locations when your code runs.
I hope this helps!

Dave

[kramkroc]

Cheers (I am the "teacher", well, coderdojo mentor). That answer really helps us out!

[Davespice]

Oh sorry!

[divad]

Hi,
I have this error when I try to install ephem (sudo pip3 install pyephem) :

arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -Ilibastro-3.7.6 -I/usr/include/python2.7 -c extensions/_libastro.c -o build/temp.linux-armv7l-2.7/extensions/_libastro.o
extensions/_libastro.c:3:20: fatal error: Python.h: Aucun fichier ou dossier de ce type
#include "Python.h"

compilation terminated.

error: command 'arm-linux-gnueabihf-gcc' failed with exit status 1


Somebody can help me?

Thank you,
David.

[Davespice]

I normally just use

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sudo pip3 install ephem

So ephem as opposed to pyephem.
You might find that installing these two packages helps

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sudo apt-get install libc6 libc6-dev

Please also check out the Mission Space Lab webinar which explains how to use it;
https://www.youtube.com/watch?v=WYjaAZcWIPg&t=7760

[DarrenPi]

Hi

I am getting a similar install error. I have tried a few different solutions including the one suggested by Dave in the above post.

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sudo apt-get install libc6 libc6-dev

I have also tried the suggestions on this page https://raspberrypi.stackexchange.com/q ... or-python3 . As I am new to Raspberry Pi I don't know how to run the command below as root

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python3 setup.py install

[DarrenPi]

Update

I have now successfully installed Ephem. I updated and upgraded raspbian, https://www.raspberrypi.org/documentati ... pdating.md