[net.astro] sunrise, sunset

mckeeman@wivax.UUCP (05/02/84)

Can someone give me a pointer to a simple formula for
sunrise(Lat, Long) and sunset(Lat,Long)?

I don't need great accuracy.  I have been using

sr = 6.0 + 1.5*sin(date-Sept21) + (Long-75)/15

for latitute 40.  A small improvement will help.