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35 lines
899 B
Markdown
35 lines
899 B
Markdown
[**moon-cycle v2.0.0**](../README.md)
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***
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[moon-cycle](../README.md) / cycleYear
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# Function: cycleYear()
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> **cycleYear**(`date?`): `string`
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Defined in: [cycleYear.ts:17](https://github.com/acamarata/moon-cycle/blob/208f7ffba1c1bce684a1b90ff94e52538d2632d3/src/cycleYear.ts#L17)
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Maps a date to the corresponding NASA moon image for the yearly cycle.
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The yearly dataset contains 8,760 hourly images covering the full calendar
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year 2023 (365 days × 24 hours). This function computes the fractional
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position within a 365-day year relative to 2023-01-01 and maps that
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fraction to an image index in [1, 8760].
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The cycle repeats annually, so dates in any year resolve to the equivalent
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hour-of-year position in the 2023 imagery.
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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. `"4380.webp"`.
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