Month

Average day

Declination (δ)

n

January

17

−20.9

17

February

16

−13.0

47

March

16

−2.4

75

April

15

9.4

105

May

15

18.8

135

June

11

23.1

162

July

17

21.2

198

August

16

13.5

228

September

15

2.2

258

October

15

−9.6

288

November

14

−18.9

318

December

10

−23.0

344