Astro Binding

The Astro binding is used for calculating many DateTime and positional values for sun and moon and for scheduling of events.

There is also a binding specifically for openHAB 2 here.

Binding Configuration

The binding can be configured in the file services/astro.cfg.

Key Default Required Description
latitude   Yes Your latitude in decimal degrees format
longitude   Yes Your longitude in decimal degrees format
interval   No Refresh interval for azimuth and elevation calculation in seconds, default is disabled

Available Items

Important: type and property are case sensitive! So enter the values exactly as shown.

  • planet sun
    • type rise, set, noon, night, morningNight, astroDawn, nauticDawn, civilDawn, astroDusk, nauticDusk, civilDusk, eveningNight, daylight (See Schedules below for the order of these events throughout the day)
      • property start, end (DateTime), duration (Number)
    • type position
      • property azimuth, elevation (Number)
    • type zodiac
      • property start, end (DateTime), sign (String)
    • type season
      • property: spring, summer, autumn, winter (DateTime), name (String)
    • type eclipse
      • property: total, partial, ring (DateTime)
  • planet moon
    • type rise, set
      • property start, end (DateTime), duration (Number), Note: start and end is always equal, duration always 0.
    • type phase
      • property: firstQuarter, thirdQuarter, full, new (DateTime), age, illumination (Number), name (String)
    • type eclipse
      • property: total, partial (DateTime)
    • type distance
      • property: date (DateTime), kilometer, miles (Number)
    • type perigee
      • property: date (DateTime), kilometer, miles (Number)
    • type apogee
      • property: date (DateTime), kilometer, miles (Number)
    • type zodiac
      • property sign (String)
    • type position
      • property azimuth, elevation (Number)

offset (optional, taken into account for every DateTime property) offset in minutes to the calculated time

You can bind a property to different item types, which has a special meaning in the binding. If you bind a DateTime property (start, end, …) to a DateTime Item, the DateTime is simply displayed. If you bind it to a Switch, an event is scheduled and the state of the Switch is updated to ON, immediately followed by a OFF at the calculated time. You can even specify an offset for the event and bind multiple items to the same property.

The position items (azimuth, elevation) and moon items (phase, distance, perigee, apogee, zodiac) are updated at the configured refresh interval in openhab.cfg.

Sun examples

// shows the sunrise
DateTime Sunrise_Time  "Sunrise [%1$tH:%1$tM]"  {astro="planet=sun, type=rise, property=start"}

// schedules a event which starts at sunrise, updating the Switch with ON, followed by a OFF
Switch Sunrise_Event   {astro="planet=sun, type=rise, property=start"}

// schedules a event which starts 10 minutes AFTER sunrise
Switch Sunrise_Event   {astro="planet=sun, type=rise, property=start, offset=10"}

// schedules a event which starts 10 minutes BEFORE sunrise
Switch Sunrise_Event   {astro="planet=sun, type=rise, property=start, offset=-10"}

// shows the sunset
DateTime Sunset_Time   "Sunset [%1$tH:%1$tM]"   {astro="planet=sun, type=set, property=end"}

// schedules a event which starts 30 minutes BEFORE sunset:
Switch Sunset_Event    {astro="planet=sun, type=set, property=end, offset=-30"}

// displays the start, end and duration of the astronomical dawn
DateTime Astronomical_Dawn_Start        "Astronomical Dawn Start [%1$tH:%1$tM]"  {astro="planet=sun, type=astroDawn, property=start"}
DateTime Astronomical_Dawn_End          "Astronomical Dawn End [%1$tH:%1$tM]"    {astro="planet=sun, type=astroDawn, property=end"}
// duration in minutes
Number   Astronomical_Dawn_Duration     "Astronomical Dawn Duration [%f]"        {astro="planet=sun, type=astroDawn, property=duration"}
// duration formatted to a string, e.g. 02:32 (2 hours, 32 minutes)
String   Astronomical_Dawn_Duration_Str "Astronomical Dawn Duration [%s]"        {astro="planet=sun, type=astroDawn, property=duration"}

// azimuth and elevation
Number   Azimuth        "Azimuth [%.2f]"     {astro="planet=sun, type=position, property=azimuth"}
Number   Elevation      "Elevation [%.2f]"   {astro="planet=sun, type=position, property=elevation"}

// zodiac
DateTime Zodiac_Start   "Zodiac Start [%1$td.%1$tm.%1$tY]"   {astro="planet=sun, type=zodiac, property=start"}
DateTime Zodiac_End     "Zodiac End [%1$td.%1$tm.%1$tY]"     {astro="planet=sun, type=zodiac, property=end"}
String   Zodiac_Sign    "Current zodiac [%s]"                {astro="planet=sun, type=zodiac, property=sign"}

// season
String Season_Name      "Season [%s]"                             {astro="planet=sun, type=season, property=name"}
DateTime Season_Spring  "Spring [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"  {astro="planet=sun, type=season, property=spring"}
DateTime Season_Summer  "Summer [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"  {astro="planet=sun, type=season, property=summer"}
DateTime Season_Autumn  "Autumn [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"  {astro="planet=sun, type=season, property=autumn"}
DateTime Season_Winter  "Winter [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"  {astro="planet=sun, type=season, property=winter"}

// eclipse
DateTime Sun_Eclipse_Total   "Sun total eclipse [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"   {astro="planet=sun, type=eclipse, property=total"}
DateTime Sun_Eclipse_Partial "Sun partial eclipse [%1$td.%1$tm.%1$tY %1$tH:%1$tM]" {astro="planet=sun, type=eclipse, property=partial"}
DateTime Sun_Eclipse_Ring    "Sun ring eclipse [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"    {astro="planet=sun, type=eclipse, property=ring"}

Moon examples

// rise, set
DateTime Moonrise_Time   "Moonrise [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"  {astro="planet=moon, type=rise, property=start"}
DateTime Moonset_Time    "Moonset [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"   {astro="planet=moon, type=set, property=end"}

// phase
DateTime  Moon_First_Quarter "First Quarter [%1$td.%1$tm.%1$tY %1$tH:%1$tM]" {astro="planet=moon, type=phase, property=firstQuarter"}
DateTime  Moon_Third_Quarter "Third Quarter [%1$td.%1$tm.%1$tY %1$tH:%1$tM]" {astro="planet=moon, type=phase, property=thirdQuarter"}
DateTime  Moon_Full          "Full moon [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"     {astro="planet=moon, type=phase, property=full"}
DateTime  Moon_New           "New moon [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"      {astro="planet=moon, type=phase, property=new"}
Number    Moon_Age           "Moon Age [%.0f days]"        {astro="planet=moon, type=phase, property=age"}
Number    Moon_Illumination  "Moon Illumination [%.1f %%]" {astro="planet=moon, type=phase, property=illumination"}
String    Moon_Phase_Name    "Moonphase [%s]"              {astro="planet=moon, type=phase, property=name"}

// distance
Number   Moon_Distance_K    "Moon distance [%.2f km]"    {astro="planet=moon, type=distance, property=kilometer"}
Number   Moon_Distance_M    "Moon distance [%.2f miles]" {astro="planet=moon, type=distance, property=miles"}
DateTime Moon_Distance_Time "Moon distance from [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"  {astro="planet=moon, type=distance, property=date"}

// eclipse
DateTime Moon_Eclipse_Total    "Moon total eclipse [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"    {astro="planet=moon, type=eclipse, property=total"}
DateTime Moon_Eclipse_Partial  "Moon partial eclipse [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"  {astro="planet=moon, type=eclipse, property=partial"}

// perigee
Number   Moon_Perigee_K     "Moon perigee [%.2f km]"    {astro="planet=moon, type=perigee, property=kilometer"}
Number   Moon_Perigee_M     "Moon perigee [%.2f miles]" {astro="planet=moon, type=perigee, property=miles"}
DateTime Moon_Perigee_Time  "Moon perigee from [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"    {astro="planet=moon, type=perigee, property=date"}

// apogee
Number   Moon_Apogee_K      "Moon apogee [%.2f  km]"    {astro="planet=moon, type=apogee, property=kilometer"}
Number   Moon_Apogee_M      "Moon apogee [%.2f miles]"  {astro="planet=moon, type=apogee, property=miles"}
DateTime Moon_Apogee_Time   "Moon apogee from [%1$td.%1$tm.%1$tY %1$tH:%1$tM]"     {astro="planet=moon, type=apogee, property=date"}

// moon zodiac
String   Moon_Zodiac_Sign   "Moon zodiac [%s]"          {astro="planet=moon, type=zodiac, property=sign"}

// moon azimuth and elevation
Number   Moon_Azimuth       "Moon azimuth [%.2f]"       {astro="planet=moon, type=position, property=azimuth"}
Number   Moon_Elevation     "Moon elevation [%.2f]"     {astro="planet=moon, type=position, property=elevation"}

// schedules a event at full moon
Switch   Moon_Full_Event    {astro="planet=moon, type=phase, property=full"}

// schedules a event 10 minutes BEFORE new moon
Switch   Moon_New_Event     {astro="planet=moon, type=phase, property=new, offset=-10"}

If you like to have the season name, zodiac sign and the moon phase name in your own language, use a map.

Example for German translation:

String Zodiac_Sign_Ger      "Tierkreiszeichen [MAP(]"  {astro="planet=sun, type=zodiac, property=sign"}
String Season_Name_Ger      "Jahreszeit [MAP(]"        {astro="planet=sun, type=season, property=name"}
String Moon_Phase_Ger       "Mondphase [MAP(]"           {astro="planet=moon, type=phase, property=name"}
String Moon_Zodiac_Sign_Ger "Mondzeichen [MAP(]"       {astro="planet=moon, type=zodiac, property=sign"}






Waxing\u0020Crescent=zunehmender Halbmond
First\u0020Quarter=erstes Viertel
Waxing\u0020Gibbous=zunehmender Mond
Waning\u0020Gibbous=abnehmender Mond
Third\u0020Quarter=letztes Viertel
Waning\u0020Crescent=abnehmender Halbmond

Example Rules

Rule at sunrise

rule "Example Rule at sunrise"
    Item Sunrise_Event received update ON

Rule to close all RollerShutters after sunset and the outside temperature is lower than 5 degrees

rule "Close RollerShutters if cold after sunset"
    Item Temp_Outside changed
    if (now.isAfter((Sunset_Time.state as DateTimeType).calendar.timeInMillis) &&
       (Temp_Outside.state as DecimalType).intValue < 5) {
       RollerShutters?.members.forEach(r | sendCommand(r, DOWN))


Let’s say, you know that the sun is shining through your living room window between Azimuth 100 and 130. If it’s summer you want to close the RollerShutter.

rule "Autoshading RollerShutter"
    Item Azimuth changed
    var int azimuth = (Azimuth.state as DecimalType).intValue
    if (azimuth > 100 && azimuth < 130) {
      sendCommand(Rollershutter_Livingroom, DOWN)



I assume, the binding is installed. It populates the astro items at startup and with scheduled jobs.

  • In the openHAB logfile there must be a entry like this:

If this entry does not exist, there is a problem in your configuration file.

  • If the items are still not populated, switch the binding to DEBUG mode and start openHAB if not already running. Now you should see for every astro item, an entry in your logfile:
Adding item ... with AstroBindingConfig[planet=..., type=..., property=...]

If you don’t see these entries, check your .items file.

  • If the maps for translation are not working, there might be a file encoding problem. Download the German example maps and edit the entries.




Multiple event types are supported. Each type has two events: start and end. In general, for all types their start and stop events coincide with a stop or start event of another type.

Planet: Sun

For the ordered list of the following 11 types, the start event is always equal to the end event of the next type. Except morningNight is always at 0:00 of the current day and eveningNight is at 0:00 of the following day.

For astrological definitions, see here.

  • morningNight
  • astroDawn
  • nauticDawn
  • civilDawn
  • rise
  • daylight
  • set
  • civilDusk
  • nauticDusk
  • astroDusk
  • eveningNight

Type noon lasts for only one minute and is during type daylight. Type night starts together with eveningNight and ends together with morningNight.