Kama ingekuwa kweli, kungekuwa na picha nyingi za mlima kilimanjaro hapo Nairobi kutoka kwenye ndege.
With that argument, people could see the moon during the day.
The moon is like a massive mirror (over 3000km wide) that reflects some of the sunlight to the earth. You don't see the moon during the day because massive sunrays overshadow (figuratively) few reflected sunrays from the moon.
It is just how the inverse square law works, as you go farther away from a luminous object the less it appears and that further depends on the size of the source.
Considering Kibo (the highest tip of the mountain you claim to see from Nairobi) is only 24km wide but 200km away, with that distance, it could not reflect enough rays to overshadow massive sunrays (during the day) for you to see it in Nairobi. The same reason you don't see the moon at noon.