Calculate Julian day

Source: R/solar.R

This function converts a date in the Gregorian calendar to a Julian day number (i.e., a method of consecutive numbering of days---does not have anything to do with the Julian calendar!)

julian_day(y, m, i)

Arguments

y

double, year.

m

double, month.

i

double, day of month.

Value

double, Julian day.

Details

  • valid for dates after -4712 January 1 (i.e., jde >= 0)

References

Meeus, J. 1991. Chapter 7 "Julian Day". Astronomical Algorithms. Willmann-Bell.