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60 lines
2.1 KiB
Markdown
60 lines
2.1 KiB
Markdown
# moon-cycle
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[](https://github.com/acamarata/moon-cycle/actions/workflows/ci.yml)
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[](LICENSE)
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Maps any JavaScript `Date` to the correct NASA moon phase image filename. Two algorithms: synodic-cycle mapping (708 images) and calendar-year mapping (8,760 images).
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Not published to npm. The image dataset (~438 MB of hourly WebP photos from NASA's Scientific Visualization Studio) lives in this repository. Use CDN or clone.
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## Install
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```bash
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# Clone to get code and images together
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git clone https://github.com/acamarata/moon-cycle.git
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# Or add the code-only package via git
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pnpm add github:acamarata/moon-cycle
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```
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## Quick Start
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```ts
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import { cycleMonth, cdnUrl } from 'moon-cycle';
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const filename = cycleMonth(); // e.g. "354.webp"
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const url = cdnUrl(filename, 'mm', 256, 75);
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// => 'https://cdn.jsdelivr.net/gh/acamarata/moon-cycle@main/mm-256-75/354.webp'
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```
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CommonJS:
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```js
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const { cycleMonth, cdnUrl } = require('moon-cycle');
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```
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## Documentation
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Full reference: [GitHub Wiki](https://github.com/acamarata/moon-cycle/wiki)
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- [API Reference](https://github.com/acamarata/moon-cycle/wiki/API-Reference)
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- [Architecture](https://github.com/acamarata/moon-cycle/wiki/Architecture)
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- [Examples](https://github.com/acamarata/moon-cycle/wiki/examples/basic-usage)
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## Related
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- [nrel-spa](https://github.com/acamarata/nrel-spa): Pure JS NREL Solar Position Algorithm
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- [pray-calc](https://github.com/acamarata/pray-calc): Islamic prayer times
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- [moon-sighting](https://github.com/acamarata/moon-sighting): Lunar crescent visibility
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## Acknowledgments
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Moon phase imagery from NASA's Scientific Visualization Studio:
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> Ernie Wright (2023). *Moon Phase and Libration, 2023* [Data set]. NASA Scientific Visualization Studio. [https://svs.gsfc.nasa.gov/5187](https://svs.gsfc.nasa.gov/5187)
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Images are in the public domain per NASA's [media usage guidelines](https://www.nasa.gov/nasa-brand-center/images-and-media/).
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## License
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MIT. See [LICENSE](LICENSE) for the full text.
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