Sunrise and Sunset - injecting current position

General
1

I have NR installed on a WYSE3040 in my Motorhome. I have also used several Nodes to get Sunrise and other Astronomical events. All of these nodes ask me to put my current position, which is fine for home, I get the Lat and Long from a map and input them, no problem.

My problem is that the Motorhome moves and I need/(would like) to put in my Lat and Long for each position I am at to get accurate times. This is a pain, especially when I can get the Lat and Long from my Router, which has a GPS Module and, along with MQTT, gives me my current position.

I have looked, but I can't see if this injection of current position is possible with any of the available Nodes, unless of course, anyone knows different and can help me figure it out.

TIA,
Colin J

2

I think, looking at its help panel, that CRON+ lets you set that via input msg which would probably be the first step?

Yup:
image

I think you use a dynamic schedule. There is some example JSON shown towards the end of the help panel.

Also see the solar events example in the library that you can import.

3

Thanks Julian, I will investigate.

I thought that CRON+ was the most likely, but couldn't see the wood as there are many, many trees!! I must admit, it is my goto when looking for times and events!!

4

The cron plus node has example flows you can import.

The "Solar events" flow includes the sunrise time of two places whose latitude and longitude are passed in as msg.payload.location.

5

Got it! Thank you.

I have been looking at all of these Nodes and just couldn't see how to do it. Seemed I could change everything other than location!

6

Not to step on Paul's solution.

I did this on an Arduino project a long time ago.
I can't find THE code - shame on me.

But a quick dig on the internet I get this:

I think you're probably remembering the Sunrise Equation in its most compact form. 
Many implementations boil the entire calculation down to a single equation that returns the hour angle, and then convert that directly to minutes after midnight.

A very common version is:

cosω=
cosϕcosδ
sin(−0.833
∘
)−sinϕsinδ
	​


where:

ϕ = latitude
δ = solar declination for the date
ω = hour angle

Then:

sunrise = 720 - 4(longitude + ω°) - E
sunset  = 720 - 4(longitude - ω°) - E

where:

longitude is in degrees (east positive)
E is the Equation of Time (minutes)
the result is minutes after midnight UTC.

Notice how compact that is: once you know δ and E for the day, it's literally just two formulas.

You receive the lat/long from the GPS and just plug the numbers into this formula.