[R] daylight

[Mark Dalphin]

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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-- 
	


    Mark Dalphin Ph.D.

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