Rainbows usually make up less than a semi-circle. From mountains they can be increasingly complete. Bill Kindred of the MMT Observatory imaged this primary and secondary from the observatory at the summit of Mt. Hopkins, Arizona. The tip of the shadow of Mt. Hopkins cast by the low sun on the distant mountains neatly marks the antisolar point and the centre of the rainbows. Image©Bill Kindred, shown with permission.
   MMT Rainbows