Unit 3 formulas not in formula book

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8 Terms

1
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Seasonal indices

= value for Season/seasonal average

2
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Deasonalising

= actual/ seasonal indices

3
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Actual figure

= deasonalised x seasonal indices

4
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Changing decimal form to degrees and minutes

Decimal part x 60

5
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Changing from degrees and minutes to decimal form

= minute part/60

6
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Length of an arc

3.14xrxtheta/180

7
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15 degrees longitude

1 hour

8
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1 degree longitude

4 minutes