Error's out during the period of minight sun. about hass-circadian_lighting

[claytonjn]

Hmm, this is an interesting problem. I have no idea how to calculate values if the sun never sets on a particular day; I would need to know what the lowest position the sun reaches is and at what time it is at that position, however I don't see any Python libraries that would provide that information. I suppose I could just have CL set values to max_colortemp and max_brightness the entire day if no sunset time is available.

Any thoughts/suggestions?

[steino]

According to https://astral.readthedocs.io/en/latest/ it can calculate solar noon and solar midnight. Could this be used for this calculation?

[claytonjn]

I'm already using both of those - there's essentially four data points and four parabolas calculated (solar noon and solar midnight might not be half way between sunrise and sunset):

I suppose what I could do if the sun never rises or never sets a particular day is use solar noon and solar midnight as the amplitudes of a sinusoidal graph. In the case of the sun never rising, the graph would be shifted down by the difference between the highest it ever gets and the horizon (would cause lights to dim from max_bightness minus that difference to min_brightness back to max_brightness minus difference). In the case of the sun never setting, the graph would be shifted up by the difference between the lowest if ever gets and the horizon (would cause lights to change from min_colortemp plus that difference to max_colortemp back to min_colortemp + difference).