What does this tool do?

It lists sunrise, sunset, twilight and golden/blue hour windows for a date and place.

Which library computes the sun?

astronomy-engine rise/set and altitude searches, not an HTTP weather API.

The stacked timeline is UTC; the printed times use your timezone.

Rise or set can be missing; remaining altitude crossings still list if found.

Twilight, golden hour and blue hour windows from latitude and date

City search (offline)

Latitude

Longitude

IANA timezone

Local date and time

Date override

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