# `Calendrical.NoDuskError`

Exception returned when a day that begins at dusk has no dusk: at a
place and date where the sun does not set, or does not go as far below
the horizon as nightfall asks, as in a polar summer.

### Fields

* `:day_start` — `:sunset` or `:nightfall`, the dusk the day begins at.

* `:location` — the place the dusk was sought at.

* `:date` — the Gregorian date the dusk was sought on.

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