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Welcome to the zon wiki! The following are example outputs.

Note: Your correct location data may be found in de zone1970.tab file:

  grep "$TZ" /usr/share/zoneinfo/zone1970.tab
  NL	+5222+00454	Europe/Amsterdam

See if the sun is up "+" or down "-":

  $ zon
  +

See the next sun rise event:

  $ zon --rise # OR zon -r
  2021-10-15T06:08+00:00

  # Same, but pretty print with standard formatting by the date command:
  $ date -d $(zon -r)
  Fri Oct 15 08:08:00 CEST 2021

Add a label to the output:

  $ zon -v --rise # OR zon -rv
  2021-10-15T06:08+00:00 rise

Specify another date:

  $ zon -r -d 2021-12-31T23:00+00:00
  2022-01-01T07:52+00:00

Specify another date with syntax of the date command:

  $ zon -rv -d "date today + 2 months"
  2021-12-15T07:46+00:00 rise

Request display of extra information for sun rise calculation:

  $ zon -rvv -d "date today + 2 months" -l +491154+0021422
  Location str (should be +DDMM[SS]+DDDMM[SS]): +491154+0021422  len 15 
  Latitude (+ is north) and Longitude (+ is east) decimal values : +49.198333 +2.239444
  running date command: date -Im -d "today + 2 months"
  system time using local time zone   Thu Oct 14 19:44:18 2021
  base time in local time zone        Tue Dec 14 18:12:00 2021
  Local Timezone secs                 -3600
   Day with at a sun set and/or rise event. RS +0
  2021-12-15T07:43+00:00 rise

Display all of current up/down, sun rise and sun set together and with a label:

  $ zon -crsv # OR zon --current --rise --set --verbose
  2021-10-15T06:08+00:00 rise
  2021-10-15T16:41+00:00 set
  - down now

Display begin of civil twighlight, is stead of sun rise, in a format usable by the systemd --on-calendar command:

  $ zon --rise --civil --systemd
  2021-10-15 05:30 UTC

Display current azimuth and altitude, together with other current information:

  $ zon -cvv # OR zon --current --verbose --verbose
  Location str (should be +DDMM[SS]+DDDMM[SS]): +491154+0021422  len 15 
  Latitude (+ is north) and Longitude (+ is east) decimal values : +49.198333 +2.239444
  system time using local time zone   Thu Oct 14 20:00:43 2021
  base time in local time zone        Thu Oct 14 20:00:43 2021
  Local Timezone secs                 -3600
  Day with at a sun set and/or rise event. RS +0
  - down now
  sun azimuth=269.911922  altitude=-11.085427

Display for a range of dates:

  $ zon$ for dd in {40..50} ; do ./zon -rd "date today + $dd day" | date -f - ; done
  Sun Oct 23 08:18:00 CEST 2022
  Mon Oct 24 08:20:00 CEST 2022
  Tue Oct 25 08:22:00 CEST 2022
  Wed Oct 26 08:23:00 CEST 2022
  Thu Oct 27 08:25:00 CEST 2022
  Fri Oct 28 08:27:00 CEST 2022
  Sat Oct 29 08:29:00 CEST 2022
  Sun Oct 30 07:31:00 CET 2022
  Mon Oct 31 07:32:00 CET 2022
  Tue Nov  1 07:34:00 CET 2022
  Wed Nov  2 07:36:00 CET 2022