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

[Gregory Coats]

Thanks. Yes, I can follow
https://www.stat.berkeley.edu/~s133/dates.html
Dates and Times in R
But my problem is, How to direct R to accept the first computed value as a sunrise, and the second computed values as a sunset?
Greg Coats
571-423-9847

> On Jul 18, 2022, at 7:58 PM, David Winsemius <dwinsemius using comcast.net> wrote:
> 
> 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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