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/**
* Calculates the Julian Day (JD) for a given date.
* ---
*
* @param year - The year of the date.
* @param month - The month of the date.
* @param day - The day of the date.
* @returns The calculated Julian Day for the given date.
*/
export default function toJD(year: number, month: number, day: number): number {
const isInt = (n: number)=>{
return n % 1 === 0;
}
const a = isInt(year);
const b = isInt(month);
const c = isInt(day);
const d = Math.abs(month) < 13;
const e = Math.abs(day) < 32
if ( a && b && c && d && e) {
const a = Math.floor((month - 3) / 12);
const x4 = year + a;
const x3 = Math.floor(x4 / 100);
const x2 = x4 % 100;
const x1 = month - 12 * a - 3;
const jd =
Math.floor((146097 * x3) / 4) +
Math.floor((36525 * x2) / 100) +
Math.floor((153 * x1 + 2) / 5) +
day +
1721119 -
0.5;
return jd ;
} else {
return NaN;
}
}
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