Sprocket:
You have received good advice...I would only add that if you get into a situation where your Chrony gives you constant errors derived from improper lighting conditions, to either get or make some Led Illuminated diffusers...
I live in an area where the lighting conditions are terrible starting on late October and until around early March (Too gray, cloudy, low light, snowy, etc.) and this situation was a constant "error" problem...So what I did was to use miniature photography led lamps that have a diffuser of their own and are cheap & battery operated...Mine have adjustable light intensity but I operate them successfully at the minimum level and I haven't changed batteries in 2 years.
When I added these Led lamps I replaced my diffusers with new ones made out out of SS Strip that are merely diffuser supports...The lamps go attached with industrial velcro underneath these supports and I use this setup every time whether there is enough light or not...It works Indoors, outdoors, with and without sun, snow, cloudy days, night, etc..
Bottomline: All of my illuminating problems went away and I haven't seen an error after the switch.
Best regards,
AZ