Using R lines() to show sunrise and sunset

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 at 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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Using R lines() to show sunrise and sunset

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