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Thesolartime package provides utilities to work with solar time,i.e. where noon is exactly when sun culminates. It provides functions tocompute

• difference between local time zone and solar time
• sun position
• sunrise, sunset, daylength, and daytime flags

# From CRAN (in future)#install.packages("solartime")# Or the the development version from GitHub:# install.packages("devtools")devtools::install_github("bgctw/solartime")

The city of Jena is located west of the timezone’s meridian. Hence, thesun culminates around 13 minutes later.

The time difference shifts during the year because ofearth orbit’seccentricity.

require(solartime,quietly=TRUE)latDeg<-50.93;longDeg<-11.57doy<-1:366locaDiffMin<-60* computeSolarToLocalTimeDifference(longDeg,timeZone=1L,doy=doy)plot(locaDiffMin~doy,ylab="time difference solar - local time (min)")abline(h=localDiff); abline(h=0,lty="dotted")

See thepackagevignettes(*.md) for further examples.