Considering that only the raindrops positioned at the surface of a cone with you at its tip can form the rainbow you are seeing, then two people standing side-by-side are observing rainbows formed by different sets of raindrops: each person has his or her own personal rainbow! And don't try to photograph your own personal rainbow in its entirety; it's too big to fit in the picture! It doesn't matter if the rainbow is formed from a garden hose or rain because a normal 35mm camera lens only has a field of view of 40 degrees. A rainbow's angular span is bigger than that. You'll have to buy a special lens.
'Beauty is a harmonious relation between something in our nature and the quality of the object which delights us.'