Add solar interpolation module

[SarahG-579462]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes #xyz
• Tests for the changes have been added (for bug fixes / features)
  • (If applicable) Documentation has been added / updated (for bug fixes / features)
• CHANGELOG.rst has been updated (with summary of main changes)
  • Link to issue (:issue:number) and pull request (:pull:number) has been added

What kind of change does this PR introduce?

• Adds a module for interpolating solar noon (and potentially other interesting solar times)

Does this PR introduce a breaking change?

• No

Other information:

Todo:

• Module code
• Optional dependencies
• Tests
• Documenting with a notebook?

[Zeitsperre]

Neat additions!

I think you should rebase on the dev-v099 branch since we're so close to the release for it. If we do put out a final v0.x version, it shouldn't have any brand new modules.

The v1 candidate branch has more subdivided extra dependencies, so it might make sense to add a new one (xclim[solar]?).

[aulemahal]

First pass before leaving for two weeks so I don't need to explain it any further.

[Zeitsperre]

This is looking really good. I'm going to restate though that this should be added to the first v1 release, given that it adds a bunch of new features and refactors several existing functions into a new (albeit much more sensible) location.

Is there a delivery date involved here or are things OK to stay as a PR for the next month or two?

[SarahG-579462]

This is looking really good. I'm going to restate though that this should be added to the first v1 release, given that it adds a bunch of new features and refactors several existing functions into a new (albeit much more sensible) location.

Is there a delivery date involved here or are things OK to stay as a PR for the next month or two?

This is fine, I'll just point towards this branch and ask them to install locally.

[aulemahal]

Suggested change

	"""The solar module offers functions for interpolating and accumulating variables to solar noon."""
	"""The solar module offers helper functions for astronomical calculations related to the sun, its position in the sky, its revolution and to the length of day."""

[aulemahal]

Suggested change

	try:
	from flox.xarray import rechunk_for_blockwise
	flox_err = None
	except ImportError:
	rechunk_for_blockwise = None

I believe this was copied from the helpers, but is not actually needed ? I think it's for resample_map which still resides in the other file.

[coveralls]

Coverage is 91.806% — solar_interp into main. No base build found for main.