Science & TechFact
Nobody sees the same rainbow you do.
Sunlight enters raindrops, reflects inside them and fans out into colours on the way out. Red light leaves the drop at about 42 degrees from the incoming ray. A rainbow is therefore a circle around the point exactly opposite the Sun, as seen from your eye. Someone standing beside you looks at different drops and sees their own bow.
Useful: The Sun must be behind you and lower than 42 degrees, which is why rainbows appear in the morning and evening, never at summer noon.
Source: en.wikipedia.org