356 F. II. Bigelow — Further Study of the Solar Corona. 



The North Pole. 



KN Position angle KDS= + 4° 27'-6 counted from N to W. 



KP ■ " EDK = -14° 22'-l " N " E. 



PN " EDS=- 9° 54'-5 " N " E. 



NM Position angle of coronal pole= — 1° 6' counted from N 

 to E. 



MC Angular distance of coronal pole from plane of disk, on 

 the side towards the earth = 1° 34'*8. 



PM Position angle of coronal pole= — 11° 0'-5 counted N to E. 



KS The inclination of the sun's equator=7° 15'. 



NKS = (270°+O)— (270° + 74°) = 126° 10'-97-74°=52° l0-'9. 



tan NK=cos NKS tan KS=8'89212. NK=4° 27'-6. 



sin SN = sin NKS sin KS=8-99866. SN = 5° 4l'-6. 



ST=SN-CM=4° 6'-8. CT=MN cos CM— 1° 5'-97. 



cos CS=cos CT cos ST = 9-99880. CS=4° 15'-4. 



cot CST=sin ST cot CT=0-57257. CST = 14° 58'-8. 



NKS = 52° 10'-9. NSK = 38° 2'-6. NSC = 14° 58'"8. 



CSK=NSK-NSC=23° 3'-8. OSK=90°. 



OSC = OSK— CSK=66° 56'-2. Heliographic longitude. 



90— SC= R5° 44'-6. " latitude. 



Coordinates of the north coronal pole : 

 Long. 66° 56'-2 

 Lat. +85° 44'-6 



The South Pole. 



KN=KDS=- 4° 2Y'-6 counted E from S. 



KP=EDK=+14° 22'-l " W " S. 



PN = EDS = + 9° 54'-5 « W " S. 



PM=EDC = 3° 54'-5 " W " S. 



PKS= 52° 10'-9. 



KS = 7-° 15'. 



SN = 5° 4l'-6. MN=6° 0'. 



KN= 4° 27'-6. MC = 1° 2.8'-0. 



ST = 7° 9'-7. 



cos SC = cos ST cos CT=9-99420. CT=5° 59'-88. 



SC = 9° 20'-5. 



cot CST=sin ST cot CT=0-07400. 



CST = 40° 8'-5. 



SKN = 52° 10'*9. 



NSK = 38° 2'-6. 



CSN= 40° 8'"5. 



CSK= 78° ll'-l. OSK=90. 



OSC=168° ll'-l. Heliographic longitude. 



90 — SC = 80° 39'-5. " latitude. 



Coordinates of the south coronal pole : 



Long. 168° ll'-l Difference of longitude. 



Lat. — 80° 39'-5 101° 14'-9 



