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32 lines
808 B
Markdown
32 lines
808 B
Markdown
[**moon-cycle v2.0.0**](../README.md)
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***
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[moon-cycle](../README.md) / cycleMonth
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# Function: cycleMonth()
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> **cycleMonth**(`date?`): `string`
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Defined in: [cycleMonth.ts:16](https://github.com/acamarata/moon-cycle/blob/208f7ffba1c1bce684a1b90ff94e52538d2632d3/src/cycleMonth.ts#L16)
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Maps a date to the corresponding NASA moon phase image for the monthly cycle.
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The monthly dataset contains 708 hourly images spanning exactly one synodic
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month (29.53 days). This function computes the fractional position within
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the current synodic month relative to the 2023-11-13 new moon anchor and
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maps that fraction to an image index in [1, 708].
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## Parameters
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### date?
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`Date` = `...`
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The date to resolve. Defaults to the current time.
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## Returns
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`string`
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A zero-padded filename string, e.g. `"354.webp"`.
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