Could a methane rain on the moon Titan produce a rainbow under the right lighting conditions? If so, can the 'angle' of such a rainbow be predicted?
Extensing @Mmesser314 's pretty answer, it may be possible in its higher athmosphere. It depends on that does an altitude exist, where
- the atmosphere is already enough rare to see the Sun (thus, sunlight is mainly unidirectional)
- but, we aren't enough high to have small liquid methane drops in it.
Even if there is such an altitude, the rainbow wouldn't be visible from the surface (because even the Sun is not visible).