from_altaz(...) does not fully populate the resultant object.

The function from_altaz creates an object lacking a center and a time, however, it has to start with a position and a time, so it seems like it should / could have those fields populated?

python-skyfield/skyfield/positionlib.py

Line 620 in 52fd26c

def from_altaz(self, alt=None, az=None, alt_degrees=None, az_degrees=None,

I'm sorry I'm not explaining it well, I've been up all night.

Here's my code that is using this. Maybe it will make it more clear.

https://github.com/bryan-lunt/celestial_navigation_homework/blob/061fb49eb0cfa2043934dfacbddd2cbbf2cd3fbb/navhw/__init__.py#L46

    sun_lower_limb_apparent.center = observer_location; sun_lower_limb_apparent.t = observed_time

Your link has disappeared over the past few weeks, but, even without seeing the example code, I can imagine how the Apparent position will get updated. I think it's quite reasonable that we would set the .center and .t for the user instead of them having to do it themselves, so I'll plan to add it to the next version of Skyfield.

Thank you!

Sorry, I did not realize that my project is still private when I posted the link.

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from_altaz(...) does not fully populate the resultant object. #1085

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from_altaz(...) does not fully populate the resultant object. #1085

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bryan-lunt commented on Jun 9, 2025

brandon-rhodes commented on Jun 27, 2025

bryan-lunt commented on Jul 19, 2025

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