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Finding Sun's Amplitude

On Nov. 21, the sun bore 101° psc to an observer in DR Position Lat 41° 29' N, Long 120° 30' E, declination is 14° 32.2' S. Find the amplitude.

Given:

    Latitude = 41° 29' N
declination = 14° 32.2' S

What is asked?

The amplitude

Solution:

Sin Amplitude = Sin declination
                        Cos latitude

                     = Sin 14° 32.2'
                        Cos 41° 29'
                     = 0.25099
                        0.74914
Sin Amplitude = 0.33504
      Amplitude = 0.33504 inv Sin
                     = 19.57 or simply
     Amplitude  = E 20 S 

* Why E 20 S? EAST because the sun bears 101°, which means it is rising. And SOUTH because that is the sign of the declination. So, just copy the sign of the declination.

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2 comments:

  1. what about deviation and variation?

    ReplyDelete
    Replies
    1. For the example of deviation, here is my post http://oic-nwreviewer.blogspot.com/2014/01/solving-for-deviation-of-compass.html

      Delete