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DATA LICENSE

The astronomical catalog data used by this software is sourced from the OpenNGC
project (https://github.com/mattiaverga/OpenNGC) and is licensed under the
Creative Commons Attribution-ShareAlike 4.0 International License (CC-BY-SA-4.0).

OpenNGC License Terms:

- Copyright (c) Mattia Verga and OpenNGC contributors
- License: CC-BY-SA-4.0 (https://creativecommons.org/licenses/by-sa/4.0/)
- Source: https://github.com/mattiaverga/OpenNGC
- Database files: NGC.csv and associated catalog data

Attribution Requirements:
When using or redistributing this software, you must:

1. Provide attribution to the OpenNGC project and Mattia Verga
2. Include a link to the OpenNGC repository
3. Indicate if changes were made to the catalog data
4. Share any derivative works under the same CC-BY-SA-4.0 license

For full CC-BY-SA-4.0 license terms, see: https://creativecommons.org/licenses/by-sa/4.0/

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THIRD-PARTY DEPENDENCIES

This software uses the following third-party libraries, each with their own licenses:

- Pandas: BSD 3-Clause License (https://github.com/pandas-dev/pandas)
- NumPy: BSD 3-Clause License (https://github.com/numpy/numpy)
- tzdata: Apache License 2.0 (https://github.com/python/tzdata) — IANA timezone database for `zoneinfo`
- TimezoneFinder: MIT License (https://github.com/jannikmi/timezonefinder)
- tqdm: MIT License (https://github.com/tqdm/tqdm)

Please refer to each library's respective repository for their full license terms.
