How to use the Ex-meridian method for calculating the ship's latitude (Planets as a celestial body)?

Using an example, this video explains the ex-meridian method of calculating the observed latitude. The example uses the sextant altitude of a planet (MARS) to obtain the latitude, bearing, and position line.
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Contents of this video will benefit mariners preparing for exams (written and oral examinations).
Mariners will also benefit by watching the following videos:

Celestial Navigation
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Meridian passage (Sun – example 1):    • How to calculate the ship's latitude ...  
Meridian Passage (Sun – example 2):    • Meridian Passage of Sun - Calculation  
Meridian passage (Sun -example 3):    • Meridian Passage Calculation -  Sun a...  
Meridian passage (Sun -example 4):    • How to calculate ship's latitude usin...  
Meridian Passage (Star):    • How to calculate the ship's latitude ...  
Meridian Passage (Planets):    • Meridian passage - Planets  
Finding the reading to set on a sextant:    • Finding the reading to set on a sexta...  
Compass error Amplitude (Sun):    • How to calculate compass error using ...  
Amplitude (Sun):    • Calculate the compass error using the...  
Amplitude (Moon):    • Calculating compass error using the a...  
Compass error Azimuth (Sun – example 1):    • Compass error calculation using the a...  
Compass error using azimuth method (Sun – example 2):    • Calculating the Compass Error using t...  
Azimuth (Sun – example 3):    • Compass error calculation (Sun as the...  
Compass error using azimuth method (Sun – example 4):    • Calculate compass error using the Azi...  
Compass error using azimuth method (Sun – example 5):    • Compass error calculation (Azimuth me...  
Compass error using azimuth method (Star – example 1):    • Calculating the Compass error - using...  
Compass error using azimuth method (Star -example 2):    • Compass error calculation (Azimuth me...  
Compass error using azimuth method (Planets):    • How to calculate the Compass error us...  
Compass error using azimuth method (Moon):    • Compass error by azimuth - Moon (cele...  
Longitude and time:    • Longitude and time - Relationship bet...  
Correcting sextant altitudes:    • Correcting sextant altitudes - Sun, S...  
Finding LHA and declination:    • Calculating a celestial body's LHA an...  
Intercept (Sun):    • Calculating the intercept and positio...  
Intercept (Sun -Example 2):    • Intercept Calculation - Celestial Nav...  
Intercept (Sun -Example 3):    • Intercept calculation and direction o...  
Intercept (Star- example 1):    • How to use the Intercept method to ca...  
Intercept (Star -example 2):    • Calculation of intercept and directio...  
Intercept (Planets):    • How to use the Intercept method  for ...  
Intercept (Moon):    • Calculating the intercept and positio...  
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Staggered observations (Example 2):    • Staggered Observations - Celestial Na...  
Variation, deviation, and compass error:    • What is the Variation, Deviation, and...  
Longitude, GHA and LHA:    • Relationship between longitude, GHA, ...