JPL changed FTP site to https #666
Comments
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I just tested and was able to perform a successful download with both Skyfield and also the manual command: But you bring up a good question: what if they were to disable the service someday? I'll go see if there's a mailing list I can join so I'd be warned ahead of time! Meanwhile, you'll probably want to check other possible sources of connectivity problems between you and the JPL servers. Let me know if you find a root cause, in case any other users are affected. I'll close the issue since it's not a Skyfield problem, but I welcome further comments on the closed issue. Thanks! |
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Though — I suppose I could go ahead and switch proactively, couldn't I? Rather than wait until a day when maybe they really take FTP down and downloads break for all users? The only thing that gives me pause is that their official README, updated last December (it says), recommends FTP links for downloading ephermides: https://ssd.jpl.nasa.gov/planets/eph_export.html But, looking elsewhere on the site, I do see more recent documents using the new /ftp top-level directory under their HTTPS site. So I'm going to presume that it's official, not temporary, and safe to switch to. This could break Skyfield for users without the right certificates installed, but given that it protects against TCP hijacking, and future-proofs against the possibility of the FTP service going down, I'm going to try making the change. I can always back it out before the next release if I realize there's a severe downside. |
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My friends and I tried to connect the ftp directly but we can't even ping through... Meanwhile, the https site alway work on our machines. |
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Unable to download （Windows 10）
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With de421.bsp loaded via pip, the statement load('de421.bsp') in Python seemed to work only near the beginning of my program. This was before other loads in the program. I note this result but have no explanation for it. |
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@JamesRRitter — What is the traceback when an error is displayed? |
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Brandon Rhodes:
Amazing!! I was just trying to save others the time that I lost trying to untangle the symptoms described below. Thanks for your response!
When the load operation is near the beginning of my program, the program operates as expected. The beginning of the program is:
def main():
pass
if __name__ == '__main__':
main()
from skyfield.api import EarthSatellite, Topos, load
from Skyfield_Support import *
from skyfield import almanac
from skyfield.api import wgs84
from skyfield.framelib import itrs
from StarShip_20230526 import GetTLE
# It appears that the load of de421.bsp must be early in the program!!
eph = load('de421.bsp')
When the load operation is in the main program with no other explicit load operations in the program, the following traceback results:
Traceback (most recent call last):
File "C:\Users\Jim\Documents\Python_Source\Python 3\Skyfield_Scratch_20230904.py", line 296, in <module>
eph = load('de421.bsp')
^^^^^^^^^^^^^^^^^
File "C:\Users\Ritte_2dotfhr\AppData\Local\Programs\Python\Python311\Lib\site-packages\numpy\lib\npyio.py", line 438, in load
raise ValueError("Cannot load file containing pickled data "
ValueError: Cannot load file containing pickled data when allow_pickle=False
From: Brandon Rhodes ***@***.***>
Sent: Monday, October 2, 2023 1607
To: skyfielders/python-skyfield ***@***.***>
Cc: JamesRRitter ***@***.***>; Mention ***@***.***>
Subject: Re: [skyfielders/python-skyfield] JPL changed FTP site to https (Issue #666)
@JamesRRitter<https://github.com/JamesRRitter> - What is the traceback when an error is displayed?
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It looks like you are calling the NumPy |
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Brandon Rhodes:
Indeed, buried two import levels down, the following appears:
from numpy import *
Thanks again!!
From: Brandon Rhodes ***@***.***>
Sent: Monday, October 2, 2023 1754
To: skyfielders/python-skyfield ***@***.***>
Cc: JamesRRitter ***@***.***>; Mention ***@***.***>
Subject: Re: [skyfielders/python-skyfield] JPL changed FTP site to https (Issue #666)
File "C:\Users\Ritte_2dotfhr\AppData\Local\Programs\Python\Python311\Lib\site-packages\numpy\lib\npyio.py", line 438, in load
It looks like you are calling the NumPy load() routine instead of Skyfield's. Maybe you have a line like this in your program?
from numpy import load
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It seems JPL's FTP was closed and upgraded to https download site.
The link ftp://ssd.jpl.nasa.gov/pub/eph/planets/bsp/ was changed to
https://ssd.jpl.nasa.gov/ftp/eph/planets/bsp/
Related files can't be downloaded.
repro steps:
Download and install python module "sfalmanac"
Run command "python -m sfalmanac"
Got the following error:
File "C:\Python37\lib\site-packages\sfalmanac_main_.py", line 328, in
ts = init_sf(spad) # in alma_skyfield
File "C:\Python37\lib\site-packages\sfalmanac\lib\alma_skyfield.py", line 98, in init_sf
eph = load(config.ephemeris[config.ephndx][0]) # load chosen ephemeris
File "C:\Python37\lib\site-packages\skyfield\iokit.py", line 193, in call
path = self._assure(url, filename, reload, backup)
File "C:\Python37\lib\site-packages\skyfield\iokit.py", line 214, in _assure
download(url, path, self.verbose, backup=backup)
File "C:\Python37\lib\site-packages\skyfield\iokit.py", line 525, in download
raise e2
OSError: cannot download ftp://ssd.jpl.nasa.gov/pub/eph/planets/bsp/de421.bsp because <urlopen error ftp error: TimeoutError
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