javascript - Given a date obtain latitude and longitude where is the sun zenith -

javascript - Given a date obtain latitude and longitude where is the sun zenith -

searching easy find terminator line (frontier between day , night) or position of sun in sky given position on earth , time; can't find how obtain zenith of sun given date (and time).

i need obtain center of illuminated zone of earth (latitude , longitude) @ given time.

any knows function?

thank you.

pd: going utilize in javascript program, there no problem if write solution in language.

javascript maps latitude-longitude