Sunset
Sunset[] gives the time of the next sunset for the current date and location.
Sunset[datespec] gives the time of the next sunset for the specified dates.
Sunset[locationspec] gives the times of the next sunset for the specified locations.
Sunset[locationspec,datespec] gives the time of the next sunset for the specified date and location.
Sunset[{{location1,date1},{location2,date2},…}] gives the times of the next sunset for all specified locations on the specified dates.
Sunset[locationspec,datespec,func] uses func to determine what to return for extended locations.
Please visit the official Wolfram Language Reference for more details and examples on core symbols.