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Air mass: Difference between revisions
Add Swift
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90.0 34.32981136 34.36666557
</pre>
=={{header|Swift}}==
{{trans|Go}}
<lang swift>import Foundation
extension Double {
var radians: Double { self * .pi / 180 }
}
func columnDensity(_ a: Double, _ z: Double) -> Double {
func rho(_ a: Double) -> Double {
exp(-a / 8500)
}
func height(_ d: Double) -> Double {
let aa = 6_371_000 + a
let hh = aa * aa + d * d - 2 * d * aa * cos((180 - z).radians)
return hh.squareRoot() - 6_371_000
}
var sum = 0.0
var d = 0.0
while d < 1e7 {
let delta = max(0.001, 0.001 * d)
sum += rho(height(d + 0.5 * delta)) * delta
d += delta
}
return sum
}
func airMass(altitude: Double, zenith: Double) -> Double {
return columnDensity(altitude, zenith) / columnDensity(altitude, 0)
}
print("Angle 0 m 13700 m")
print("------------------------------------")
for z in stride(from: 0.0, through: 90.0, by: 5.0) {
let air = String(
format: "%2.0f %11.8f %11.8f",
z,
airMass(altitude: 0, zenith: z),
airMass(altitude: 13700, zenith: z)
)
print(air)
}</lang>
{{out}}
<pre>Angle 0 m 13700 m
------------------------------------
0 1.00000000 1.00000000
5 1.00380963 1.00380965
10 1.01538466 1.01538475
15 1.03517744 1.03517765
20 1.06399053 1.06399093
25 1.10305937 1.10306005
30 1.15418974 1.15419083
35 1.21998076 1.21998246
40 1.30418931 1.30419190
45 1.41234169 1.41234567
50 1.55280404 1.55281025
55 1.73875921 1.73876915
60 1.99212000 1.99213665
65 2.35199740 2.35202722
70 2.89531368 2.89537287
75 3.79582352 3.79596149
80 5.53885809 5.53928113
85 10.07896219 10.08115981
90 34.32981136 34.36666557</pre>
=={{header|Wren}}==
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