Kafrican
JF-Expert Member
- Jan 26, 2015
- 7,251
- 7,037
I dont think its correct.From the diagram, the angle 0.57 degrees is just a half angle, the visual angle is 0.57 x 2 = 1.14 degrees. So rounding it off to 1 degree (twice the visual angle of the moon and sun) is correct.
Because when you are looking at the moon, you are looking at an object which you see from top to bottom, where as when you are looking at Mt.Kilimanjaro from 200km away, you are obscured by the earth bieng circle and all, Staring at Mt.Kili is equivalent to staring at half a moon just when the moon is "rising"...Therefore what we see (or we think we see) as the base of the Mountain may actually be like 1 Km above the base of the Mountain going upwards .... And aside from that, the calculation for the moon uses its Diameter to arrive at that 0.5 degrees
Anyway, in short, eigther use half of that angle (the 0.57 degrees) or switch to calculating using the diameter of Mt.Kilimanjaro and not the height
But then again, if you insist on using the height or even the diameter then you will need to factor in the curveture of the earth, i.e How many degrees we are between Nairobi and Kili in terms of longitudes and latitudes
Because, likee in this picture, Our horizons are different when standing on earth, From Nairobi we could only be seeing 3/4 of the mountain because the other 1/4 is blocked by earth