# `Calendrical.AstronomyError`

Exception returned when an astronomical calculation behind a calendar
cannot be made for a reason other than the dates it covers, which
`Calendrical.UnsupportedDateRangeError` describes.

### Fields

* `:calendar` — the calendar or module whose calculation it was.

* `:value` — the year or date the calculation was made for.

* `:reason` — the reason `Astro` gave, such as `:no_time`.

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*Consult [api-reference.md](api-reference.md) for complete listing*