At Lat 55° 53' N, Long 130° 18 W, sun's declination is 12° 40' S. Find the true azimuth (Zn) at sunset.
Given:
Latitude = 55° 53'
Declination = 12° 40' S
What is asked?
True azimuth at sunset
Solution:
1. We have to get first the amplitude. This is the formula for amplitude:
Sin amplitude = Sin Declination
Cos Latitude
= Sin 12° 40'
Cos 55° 53'
= 0.21928
0.56088
Sin Amplitude = 0.39096
= 0.39396 inv Sin
Amplitude = W 23 S (West because the sun is setting)
(3rd quadrant)
2. Solving for true azimuth. Since the sun is setting, we have to subtract 270° by our amplitude.
270°
- 23° (minus because it is in the 3rd quadrant)
247° T is the true azimuth of the sun at sunset
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Given:
Latitude = 55° 53'
Declination = 12° 40' S
What is asked?
True azimuth at sunset
Solution:
1. We have to get first the amplitude. This is the formula for amplitude:
Sin amplitude = Sin Declination
Cos Latitude
= Sin 12° 40'
Cos 55° 53'
= 0.21928
0.56088
Sin Amplitude = 0.39096
= 0.39396 inv Sin
Amplitude = W 23 S (West because the sun is setting)
(3rd quadrant)
2. Solving for true azimuth. Since the sun is setting, we have to subtract 270° by our amplitude.
270°
- 23° (minus because it is in the 3rd quadrant)
247° T is the true azimuth of the sun at sunset
If you find this helpful, please click the share button below to share this post to your friends. Sharing is caring...
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