Question

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:

Answer 1

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.