I would start with the data. My source for this is the US Navy
Sunrise/Sunset tables:
http://aa.usno.navy.mil/data/docs/RS_OneYear.php
The page is produces is pure text; I've previously extracted the values
with a simple Perl script, but would do it today using R (in general,
most of the parsing I used to perform in Perl can readily be performed
in R).
Once I had the data available as a data frame, I'd convert the columns
to POSIXct format and then use difftime().
Cheers,
Mark
bambus wrote:
hi there,
does anyone know how to calculate the amount of daylight on every day of the
year in R? I mean the time between sunrise and sunset.
thanks
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