Solar Isolation Chart

Back when I began assembling the solar electrical systems listed in my signature,  I had found a web site that clearly showed Solar Isolation for various cities around the world. Specifically it had cities in the Dominican Republic. It made very clear the sun available on various days of the year at various times of the day.  It was so complete, showing dates, sun angles, and times for dawn, dusk, sunrise, sunset with graphics.  It was a great resource for explaining to people some of the limits of solar power generation.

I am now trying to educate someone else in the operation of these systems.  I cannot find this great resource now.

Any help would be appreciated.

John