Dawn & Dusk, atmospheric events involved with sunrises and sunsets

The biggest project in which I am involved. I would like to share my observations of twilight, mornings and evenings. Every observation includes photo details, location details and date. I am also showing the twilight calculation with graphs for total hemisphere. The main purpose of this project is the
influence the twilight duration on the Variability of the Electricity Consumption.
My basic conclusions means, that once Sun is less than 4deg below the horizont you don't need to use switch outside (and inside a front of dawn or dusk). Learn more...

I divided this project for several parts, as you can see below: