Dennis Murczak

Great, if we get the math figured out and the calculator can be implemented I can give you credit in the README if you like.

I got it solved by correcting the formula in J49 (which I had generated using an online solver) to have the H47 value in radians and then converting everything to...

@ARGHouse: The converter between equatorial and galactic coordinates is now complete and in the git repo. Any feedback? And how would the calculator for cartesian coordinates work? Do you mean...

Okay. For easier debugging you can make the hidden calculations visible again by unprotecting the Conversion sheet (right-click the tab), selecting the cells and and changing the cell style from...

That is the formula I obtained using an equation solver[^1] from, I think, the third formula under "3.2.2 Transformation" in [^2]. I solved for `α`. [^1]: https://www.numberempire.com/equationsolver.php [^2]: https://aas.aanda.org/articles/aas/full/1998/01/ds1449/node3.html

By the way, for it to solve, I had to replace the constants `α0`, `δ0` and `l0` with their numeric values.

Correction: It was formula 6 on page 8 of this PDF file[^1] that I fed into the solver. Here is [the direct link](https://www.numberempire.com/equationsolver.php?function=tan%28a-192%29%3D%28cos%28l-122%29%29%2F%28tan%28b%29%2Acos%2827%29-sin%2827%29%2Asin%28l-122%29%29&var=a&result_type=false&answers=&_p1=2042). [^1]: https://sarahspolaor.faculty.wvu.edu/files/d/bff87be8-3998-4745-9a00-7d57560f261d/07_notes.pdf

Oops, then by being "lossy" that solver was the only one able to cope with that transformation formula. The Mathway one refused for example. But there has to be a...

Yes, I counter-checked using the [NED coordinate calculator](https://ned.ipac.caltech.edu/coordinate_calculator) and I see issues with very small values of `b` < 0.48. So we need an IFS branch with a separate formula...

Ok, then I will play around a bit with the formula systems (either later or tomorrow) and see what I get. I still need to run them through the solver...