Early Rainbow
As we chased the storm cell across the countryside, the sun broke out from behind the cell and illuminated the rain falling from it. It was 4:05 pm, a good four and a half hours before sunset, so the sun was still quite high in the sky. So high, in fact, that only the very top of the rainbow can be seen. At least that's what it seems like... in fact, the rainbow doesn't have physical existence, so it has no top or bottom. The raindrops that would have contributed to any "lower" portion of the rainbow simply hit the ground before they could do so. Because of that, the rainbow cannot "exist" below the horizon, unless one is situated in such a way that illuminated rain is visible below eye-level, such as on the rim of a canyon, a mountain top, or a garden hose spraying a fine mist while one looks at it with their back to the sun.
Early Rainbow
As we chased the storm cell across the countryside, the sun broke out from behind the cell and illuminated the rain falling from it. It was 4:05 pm, a good four and a half hours before sunset, so the sun was still quite high in the sky. So high, in fact, that only the very top of the rainbow can be seen. At least that's what it seems like... in fact, the rainbow doesn't have physical existence, so it has no top or bottom. The raindrops that would have contributed to any "lower" portion of the rainbow simply hit the ground before they could do so. Because of that, the rainbow cannot "exist" below the horizon, unless one is situated in such a way that illuminated rain is visible below eye-level, such as on the rim of a canyon, a mountain top, or a garden hose spraying a fine mist while one looks at it with their back to the sun.