grahan — the open-source sky engine
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    Function julianDayFromDate

    • Julian day of a JavaScript Date (which is always an instant in UTC).

      Parameters

      • date: Date

      Returns number

      RangeError if date is not a valid Date (e.g. new Date(NaN))

      julianDayFromDate(new Date(Date.UTC(2000, 0, 1, 12))); // 2451545 (J2000.0)

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