1 Calculate the magnetic declination for the year 2020. Show ALL calculations. Marks will be
allocated for calculations. Use the following guidelines:
Difference in years:
Mean annual change:
Total Change:
Magnetic declination for 2020:
To calculate the magnetic declination for the year 2020, we need to follow these steps:
Step 1: Determine the difference in years from the reference year (for example, 1900) to the year 2020. This can be calculated by subtracting the reference year from 2020.
Difference in years = 2020 - 1900 = 120 years
Step 2: Determine the mean annual change. The mean annual change refers to the average change in magnetic declination over a year.
According to the guidelines given, the mean annual change can be assumed to be 0.12 degrees per year.
Mean annual change = 0.12 degrees/year
Step 3: Calculate the total change by multiplying the difference in years by the mean annual change.
Total Change = Difference in years * Mean annual change
Total Change = 120 years * 0.12 degrees/year
Total Change = 14.4 degrees
Step 4: Finally, calculate the magnetic declination for the year 2020 by adding the total change to the magnetic declination of the reference year.
Magnetic declination for 2020 = Magnetic declination of reference year + Total Change
Note: The magnetic declination of the reference year is not given in the guidelines, so we cannot provide the exact magnetic declination for 2020 without that information.