Source of ephemerides unclear

[ghost]

The Loader should indicate the URL it is downloading.

The docs should explain how Loader arrives at a URL.

[brandon-rhodes]

Agreed, there should be a call that maps files to URLs so that people can see the URL if they want. I'll document the call if it already exists, else add one!

[brandon-rhodes]

@StephenCarboni — It looks easy to add a build_url(filename) method to the load object, so that interested users can ask which URL will be downloaded if they ask for a particular filename:

>>> load.build_url('de421.bsp')
'ftp://ssd.jpl.nasa.gov/pub/eph/planets/bsp/de421.bsp'

Would that be a sufficient resolution for the issue?

[ghost]

Looks good to me.

[brandon-rhodes]

The feature will be in the next version of Skyfield. Thanks for the idea!