sunrise and sunset values

[Thomas]

Hi
Can I see sunrise and sunset times for today (in local time)? In some value, group object or as a result of a function?

Thank you

[admin]

You can use rscalc function from common functions to get sunrise and sunset time in minutes. Then you can convert it to text (or use a day/time object instead):

Code:

latitude = 11.11
longitude = 22.22
sunrise, sunset = rscalc(latitude, longitude)

sunrise_hour = math.floor(sunrise / 60)
sunrise_minute = sunrise % 60

sunset_hour = math.floor(sunset / 60)
sunset_minute = sunset % 60

sunrise_text = string.format('%02d:%02d', sunrise_hour, sunrise_minute)
sunset_text = string.format('%02d:%02d', sunset_hour, sunset_minute)

[Thomas]

Hi
Thank you for your reply but the first two rows are the problem. I don't want two separated stores for geo coordinates. I set these values in the system date/time dialogue. Can I at least read it from here?

The best solution would be if the system took these values from KNX objects provided by my meteo station.

[admin]

See this post: https://forum.logicmachine.net/showthread.php?tid=997

[Thomas]

Thank you it works.

[buuuudzik]

You can use rscalc function from common functions to get sunrise and sunset time in minutes. Then you can convert it to text (or use a day/time object instead):

Code:

latitude = 11.11
longitude = 22.22
sunrise, sunset = rscalc(latitude, longitude)

sunrise_hour = math.floor(sunrise / 60)
sunrise_minute = sunrise % 60

sunset_hour = math.floor(sunset / 60)
sunset_minute = sunset % 60

sunrise_text = string.format('%02d:%02d', sunrise_hour, sunrise_minute)
sunset_text = string.format('%02d:%02d', sunset_hour, sunset_minute)

I've checked this script and probably is something wrong. E.g. for Lublin, PL google maps link:
https://www.google.pl/maps/place/Lublin/...4463?hl=pl

Based on this link I've filled the lat and lng:

Code:

lat = 22.4937308
lng = 51.2181956

sunrise, sunset = rscalc(lat, lng)

sunrise_hour = math.floor(sunrise / 60)
sunrise_minute = sunrise % 60

sunset_hour = math.floor(sunset / 60)
sunset_minute = sunset % 60

sunrise_text = string.format('%02d:%02d', sunrise_hour, sunrise_minute)
sunset_text = string.format('%02d:%02d', sunset_hour, sunset_minute)
log(sunrise_text, sunset_text)

The result is wrong:

Code:

* arg: 1
 * string: 04:01
* arg: 2
 * string: 15:35

It should be round about 6:23 for sunrise and 17:03 for sunset.

[admin]

Does your LM have correct date, time and timezone set?

[buuuudzik]

Does your LM have correct date, time and timezone set?

I think yes. Please see into attached screenshot. I've tested this also with minus values.

[admin]

Well, LAT = 22.4937308 LNG = 51.2181956 is somewhere in Saudi Arabia You have them in reverse.

[buuuudzik]

But why google API has such address? See below link:

Code:

https://www.google.pl/maps/place/Lublin/@51.2181956,22.4937308,12z/data=!3m1!4b1!4m5!3m4!1s0x472257141e154061:0x5528ee7af6e8e95f!8m2!3d51.2464536!4d22.5684463?hl=pl

I've checked with also -22 and also not right.

---

See what I've found in User guide for Spacelynk and what I've found on Google Maps for Lublin. And also on page latlong.net

[admin]

In the script you posted you have:

Code:

lat = 22.4937308
lng = 51.2181956

Which in fact should be:

Code:

lat = 51.2181956
lng = 22.4937308

With these values today's sunrise/sunset is at 06:20/17:06

[buuuudzik]

Right

I had no problem in my suncalculation script because I had there appriopriate order. But what about positive and negative values? In above screenshot from google there is no sign but should be. Can you maybe add some info about this into your manual?

But if it is about these values I've checked the trend from twilight sensor and 0lux is at 5:50 and 17:50. If it is about sun elevation 0° is at 6:40 and 17:05. What is the goal of this sunset sunrise script? Checking if elevation == 0° or other value?

[admin]

There are several types of sunrise/sunset, rscalc gives values when sun is at 0°.
Why do you think there should be a sign in coordinates for a location in Poland? It is above equator and east of Greenwich, so both latitude and longitude are positive numbers.

[buuuudzik]

Because when I've started to deal with this subject I was using this site(Berlin is also on the East side):
https://www.esrl.noaa.gov/gmd/grad/solcalc/azel.html

and also I remeber that this can be different, so it is good when it is clearly specified in the manual.

[admin]

That's because it a US website. They also have time zone offsets in reverse, Berlin should be UTC +1. Their interpretation of longitude is incorrect and misleading.

[buuuudzik]

I know such situation like A B and + - in RS-485 But google is also US company and NOAA is some governmental departure so sounds very professional Good to know how it is on LM. Thanks Admin

[Mrinj]

Hi,

Can someone help me, please!
How can I compare (in a if / elseif) the sunrise and sunset results (from Admin's script above) to os.time() to define if it is morning, day ore evening?

Best,

[admin]

Code:

latitude = 11.11
longitude = 22.22
sunrise, sunset = rscalc(latitude, longitude)

date = os.date('*t')
now = date.hour * 60 + date.min

-- from 0:00 to sunrise
if now < sunrise then
  alert('before sunrise')
-- from sunset to 23:59
elseif now > sunset then
  alert('after sunset')
else
  alert('day')
end

[Mrinj]

Code:

latitude = 11.11
longitude = 22.22
sunrise, sunset = rscalc(latitude, longitude)

date = os.date('*t')
now = date.hour * 60 + date.min

-- from 0:00 to sunrise
if now < sunrise then
 alert('before sunrise')
-- from sunset to 23:59
elseif now > sunset then
 alert('after sunset')
else
 alert('day')
end

Thanks you, Admin!

[FatMax]

You can use rscalc function from common functions to get sunrise and sunset time in minutes. Then you can convert it to text (or use a day/time object instead):

Code:

latitude = 11.11
longitude = 22.22
sunrise, sunset = rscalc(latitude, longitude)

sunrise_hour = math.floor(sunrise / 60)
sunrise_minute = sunrise % 60

sunset_hour = math.floor(sunset / 60)
sunset_minute = sunset % 60

sunrise_text = string.format('%02d:%02d', sunrise_hour, sunrise_minute)
sunset_text = string.format('%02d:%02d', sunset_hour, sunset_minute)

Is it possible to get unix time when using rscalc? I'm using the values from the settings (lat, long), but getting 600 as result from sunrise = rascals(latitude).