if (2 == sscanf(argv[i], "%lf%1[Xx]", &temp, hemisphere)) {
      lon = temp;
      coords_set |= LON_SET;
    }

root@OpenWrt:/tmp#  ./sunwait -p 52.1257308N 21.0675461x
Using location:             52.125731N, 21.067546E
Date:                        3 Aug 2016 
Local time:                 20:30 
Day length:                 15:22 hours
With civil twilight         16:39 hours
With nautical twilight      18:27 hours
With astronomical twilight  20:56 hours
Length of twilight:  civil   0:38 hours
                  nautical   1:32 hours
              astronomical   2:47 hours
Current specified time zone: CEST (2 from UTC) 
Sun transits meridian 1241 CEST
                   Sun rises 0502 CEST, sets 2021 CEST
       Civil twilight starts 0422 CEST, ends 2101 CEST
    Nautical twilight starts 0327 CEST, ends 2155 CEST
Astronomical twilight starts 0213 CEST, ends 2310 CEST
root@OpenWrt:/tmp# 

#!/bin/sh
sunwait wait rise offset -0:01:00 51N 22E
sunrise () {
 mpg123 -f 16000 -q /root/scripts/sounds/sunrise.mp3
 sh /root/scripts/say-time.sh
}
if mpc status | grep playing >/dev/nul      # If mpd is playing
then
 mpc toggle -q
 sunrise
 mpc toggle -q
else
 sunrise
fi