The time for sunrise and sunset from 90 degree in am and pm. +ve above the horizon, -ve below the horizon.

sunRiseSet(doy, lat, long, timezone = 0, angle = 6, flag = "rise")

Arguments

doy: day of year number
lat: latitude of site (deg)
long: longitude of site (deg)
timezone: local time
angle: angle to measure time between, such as twilight (deg). angular distance between 90 deg and end of twilight - altitude of sun. +ve up, -ve down.
flag: rise or set