The Sun is always at the back of your head/eyes with the rainbow directly in front of your eyes. Therefore the rainbow is always west (mornings), north (day) or east (afternoon) (for the northern hemisphere). Which means no two or more people can see the same rainbow!
Just as the relationship of hypotenuse of face/base to centre of the Great Pyramid is Phi/1 (angle of face is 51.82729237). Which is the angle of incidence of the secondary rainbow often observed in the aftermath of large storms.
Primary Arc: 40° - 42°
Secondary Arc: 52° 15'
Circular Glory Rainbow
12 types of rainbows
The following scheme endeavours to show that the development of the musical gamut and the colours of the rainbow are regulated by the same laws. I wish it to be clearly understood that I have gained the evolutions from the mysterious type of Life—a golden thread running throughout the Scriptures, from the first chapter of Genesis to the last of Revelation;—life developing around us and within us from the Almighty, who is its Eternal Fountain. My youthful impressions included the belief that the views of Dr. Darwin, my great-uncle, contradicted the teaching of the Scriptures, and I therefore avoided them altogether. Having endeavoured for years to gain correctly the laws which develope Evolution, I suddenly discovered that I was working from Scripture on the same foundation which he had found in Creation; and as Creation and Revelation proceed from the same Author, I knew that they could not contradict each other. It is considered by many that my cousin, Charles Darwin, gained his first ideas of Evolution from his grandfather's works; but I know from himself that he was ignorant of them, and that his theory of Evolution was arrived at by his close experiments and observations of the laws of creation alone. Only a few months since, after reading his work on "the Movements of Plants," published in 1881, and wishing to be certain that I had not an incorrect belief, I asked the following question—"Did you gain your views on Evolution by your wonderfully acute observations, ignorant of your grandfather's ideas?" The reply was, that he had done so entirely from his own observations. [Harmonies of Tones and Colours, Introduction1 - Harmonies, page 9]
The primitive laws of any science should be capable of succinct statement, but in combination with others they become more complex and delicate, and error is proved if in the developments they do not echo each other. If, therefore, musical harmonies are correctly gained, the same laws will develope harmonies of colour, and will agree with the colours of the rainbow, the circle of which is divided by the horizon. All who are interested in the laws which regulate these two sciences will doubtless know the interesting lectures delivered by W. F. Barrett (Professor of Experimental Physics in the Royal College of Science, Dublin), and the article written by him and published in the Quarterly Journal of Science, January, 1870, entitled "Light and Sound; an examination of their reputed analogy, showing the oneness of colour and music as a physical basis." I will quote shortly from the latter for the benefit of those who may not have met with it. "The question arises, Has all this æsthetic oneness of colour and music any physical foundation, over and above the general analogy we have so far traced between light and sound? We believe the following considerations will show, not only that it has some foundation, but that the analogy is far more wonderful than has hitherto been [Harmonies of Tones and Colours, On Colours as Developed by the same Laws as Musical Harmonies1, page 18]