Best Days to color hair

Hi everybody. I am 57 years old and have been using henna for over 30 years. I experimented with a die once when I was a teenager and that was it. Henna is messy, it takes time, not all henna is good henna. Some are better than others
However it is my preference and it mixes well with my natural chestnut color hair. I also do it myself. It is too messy for many salons to perform and then you have to stay there for some time. I usually do it when I would be home all day and can do some housework at home while waiting for the time to pass. Thanks to the lunar calendar now I can make better choices in knowing when to do it. Thank you so much for all the information. Appreciate it very much.