During summer of 2005, If you were lucky enough to have made it to the Palyul Upstate Retreat Center, especially on a day of Namcho Amitabha empowerment, you could have seen rainbows in sky without thick clouds and surely without rain as well as Sun and Moon simultaneously in the same time in the sky on opposite sides as well as on same side. Moments before Amitabha Empowerment Ceremony there was a very bright sunshine and 1st rainbow appeared, it seemed to point in direction of the temple and I have missed most of it’s display so picture that I thought (and when I thought of it) of taking does not reveal much. Second rainbow that appeared at a much later time seemed to point directly towards Kyabje Rinpoche compound and was clearly seen just before Khenchen Pema Sherab arrived to the main temple to give weekend evening teaching.
An observer may think that it is more along the lines of sun shining through the evening sky. However if one were to look at the Dharma wheel mounted on top of porch awning of the temple, then one would see sun glow coming from the right side of the picture. So rainbow appears to be cast in a very wide sphere around the sun.