jd: Julian Day Number

In moonsun: Basic astronomical calculations with R

Description

Compute the Julian Day Number for a given date, optionally generating a sequence.

Usage

jd(year = NULL, month = NULL, day = NULL, epoch = Sys.time(), length = 1, by = 1)

Arguments

year	year
month	month
day	day
epoch	epoch (number of seconds since 1st January 1970 0000 UTC)
length	length of sequence
by	step of sequence

Details

If any of the year, month or day parameters is given (and thus nonzero) the date is taken from these parameters. If not, the epoch parameter is considered (default taken from system timer).

Value

A vector of Julian Day Numbers.

Author(s)

Lukasz Komsta

Examples

jd()
jd(1978,10,16)
jd(length=10)

moonsun documentation built on May 29, 2017, 12:17 p.m.