daycnv: Convert Julian dates to Gregorian calendar dates
In astrolibR: Astronomy Users Library
Description
Usage
Arguments
Details
Value
Author(s)
Examples
Description
Convert Julian dates to Gregorian calendar dates
Usage
1
daycnv(xjd)
Arguments
xjd
Julian Date [scalar or vector]
Details
If the input xjd is a vector, then the outputs (yr,mn,day, and hr) will be vectors of the same length.
Uses the algorithm of Fliegel and Van Flandern (1968) as reported in
the "Explanatory Supplement to the Astronomical Almanac" (1992), p. 604
Works for all Gregorian calendar dates with XJD > 0, i.e., dates after
-4713 November 23. Be sure that the Julian date is specified as double precision to maintain accuracy at the fractional hour level.
Other conversions and manipulations of Julian dates are provided by the CRAN packages chron and dates.
Value
yr
year (integer)
mn
month (integer)
day
day (integer)
hr
hours and fractional hours (real)
Author(s)
Converted to IDL from Yeoman's Comet Ephemeris Generator, B. Pfarr, STX, 1988
R adaptation by Arnab Chakraborty (June 2013)
Examples
1
daycnv(2440000.0) # 1200 on May 23 1968
Example output
$yr
[1] 1968
$mn
[1] 2
$day
[1] 0
$hr
[1] 12
astrolibR documentation built on May 2, 2019, 3:26 a.m.
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Description Usage Arguments Details Value Author(s) Examples
Description
Convert Julian dates to Gregorian calendar dates
Usage
1 | daycnv(xjd)
|
Arguments
xjd |
Julian Date [scalar or vector] |
Details
If the input xjd is a vector, then the outputs (yr,mn,day, and hr) will be vectors of the same length.
Uses the algorithm of Fliegel and Van Flandern (1968) as reported in the "Explanatory Supplement to the Astronomical Almanac" (1992), p. 604 Works for all Gregorian calendar dates with XJD > 0, i.e., dates after -4713 November 23. Be sure that the Julian date is specified as double precision to maintain accuracy at the fractional hour level.
Other conversions and manipulations of Julian dates are provided by the CRAN packages chron and dates.
Value
yr |
year (integer) |
mn |
month (integer) |
day |
day (integer) |
hr |
hours and fractional hours (real) |
Author(s)
Converted to IDL from Yeoman's Comet Ephemeris Generator, B. Pfarr, STX, 1988
R adaptation by Arnab Chakraborty (June 2013)
Examples
1 | daycnv(2440000.0) # 1200 on May 23 1968
|
Example output
$yr
[1] 1968
$mn
[1] 2
$day
[1] 0
$hr
[1] 12
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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