[R] Using R lines() to show sunrise and sunset

[David Winsemius]

The first thought it to do is make sure you have the data in POSIXct format for the date times. 

Sent from my iPhone

> On Jul 18, 2022, at 6:51 PM, Gregory Coats via R-help <r-help using r-project.org> wrote:
> 
> I compiled a program on my Apple MacBook that takes as inputs
>    Year and Month and Day
>    Latitude and Longitude
> And then computes these two outputs
> Sunrise Year-Month-Day Hour:Minute:Second
> Sunset  Year-Month-Day Hour:Minute:Second
> It automatically handles Daylight Savings Time.
> A typical input, followed by the automatically computed outputs looks likes this.
> 
> ./sunrise_05 2022 01 1 38.8586314239524 77.0512533684194
> 2022-01-01 07:26:45 2022-01-01 16:57:07
> ./sunrise_05 2022 01 2 38.8586314239524 77.0512533684194
> 2022-01-02 07:26:52 2022-01-02 16:57:56
> 
> I want to use R’s lines() command to show the sunrise and sunset times for the year 2012. How do I tell R that the first computed output is sunrise, and the second computer output is sunset?
> Greg Coats
>    [[alternative HTML version deleted]]
> 
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