The only thing the map proves is that the author's data is phony.
For example, El Paso TX is shown in the map as almost ZERO days having a sunrise time before 7AM. This is utterly phony. In the entire month of June, for example, the latest sunrise is 6:03AM CDT... which is 5:03AM standard time. (Source: http://www.sunrisesunset.com/)
In fact, sunrise was 7AM CDT or earlier from March 28 through October 3rd... more than HALF the year!
For example, El Paso TX is shown in the map as almost ZERO days having a sunrise time before 7AM. This is utterly phony. In the entire month of June, for example, the latest sunrise is 6:03AM CDT... which is 5:03AM standard time. (Source: http://www.sunrisesunset.com/)
In fact, sunrise was 7AM CDT or earlier from March 28 through October 3rd... more than HALF the year!
Nothing is proven using phony data.