156 



H. Crew — .Rotation of the Sun. 



The following table includes all observations made ; they are 

 arranged in order of increasing latitudes. In the sixth column, 

 are given the equatorial velocities, corresponding to the synodic 

 period ; these are obtained by dividing each of the observed 

 velocities by the cosine of its respective latitude, given in col- 

 umn five, i. e., on the assumption that the sun rotates as a solid 

 body. In column 7 will be found the differences between each 

 value in column 6, and the mean of all the values in column 6. 



Table I. 



Date. 



Mean Time 

 of 

 Observa- 

 tion. 



Line 

 Observed. 



No. 

 Settings. 



Latitude of 

 Observation. 



(v'-v")— a sin <p 



(miles per 



sec.) 



Differences. 



July 16 



n ii 23m 



"1474" 



13 



0°47 



2-223 



— •128 



Feb. 28 



1 29 



b 



6 



1-05 



2-177 



-•174 



July 18 



11 07 



E 2 



13 



2-00 



2-150 



—•201 



July 18 



11 42 



D, 



13 



6-35 



2-297 



— •054 



July 12 



11 11 



D 2 



13 



6-64 



2-070? 



— ■281 



Mch. 8 ' 



1 06 



5173-8 



10 



6-81 



2-293 



-•058 



Feb. 28 



1 42 



b 



8 



6-96 



2-408 



+ •057 



July 12 



11 52 



" 1474" 



13 



7-37 



2-309? 



-•042 



July 18 



10 54 



Bid 



10 



8-66 



2-219 



— •132 



Mch. 8 



12 50 



D x 



9 



10-35 



2-327 



-•024 



Mch. 15 



12 45 



5173-8 



10 



10-37 



2-531 



+ •180 



Mch. 30 



12 16 



D 2 



15 



11-84 



2-405 



+ •054 



July 15 



11 53 



Bid 



13 



11-86 



2-067 ? 



-•284 



July 22 



12 33 



" 1474," 



13 



14-47 



2-371 



+ -020 



Mch. 8 



12 33 



Dx 



9 



14-74 



2-434 



+ •083 



Feb. 28 



12 25 



5173-8 



12 



15-37 



2-543 



+ •192 



July 16 



1 16 



D 2 



13 



15-83 



1-950 



— •401 



Mch. 15 



12 25 



D, 



9 



16-06 



2-272 



-•079 



Mch. 30 



1 59 



D 2 



12 



16-18 



2406 



+ -055 



July 15 



] 26 



" 1474" 



13 



18-36 



1-914? 



-•437 



July 15 



11 54 



D 2 



13 



18-44 



2-093 ? 



-•258 



July 18 



12 37 



"1474" 



13 



19-58 



2-228 



— •123 



Feb. 28 



12 41 



5173-8 



7 



20-75 



2-756 



+ •405 



July 22 



1 00 



Di 



13 



21-89 



2-083 



-268 



Mch. 8 



12 41 



5166-3 



8 



22-19 



2-670 



+ •319 



Mch. 26 



1 -55 



Di 



10 



23-17 



2-720 



+ •369 



Mch. 8 



12 19 



Di 



7 



23-28 



2-570 



+ •219 



Mch. 16 



11 47 



5173-8 



10 



24-51 



2-727 



+ •376- 



Mch. 8 



11 53 



5171-7 



7 



24-96 



2-719 



+ •368 



Mch. 11 



11 53 



Di 



6 



26-34 



2-514 



+ •163 



Mch. 30 



11 18 



"1474" 



22 



27-16 



2-565 



+ •214 



Mch 11 



11 35 



5173-8 



6 



27-45 



2-691 



+ '340 



Mch. 8 



11 38 



5171-7 



14 



28-87 



2-496 



+ •145 



Mch. 16 



11 28 



Di 



10 



29 00' 



2-360 



+ •009 



July 12 



1 41 



Eid 



13 



30-00 



2-475 



+ •124 



Apr. 8 



11 24 



Di 



10 



30-64 



2-366 



+ •015 



July 16 



1 35 



E, 



13 



31-10 



2-427 



+ •076 



July 18 



1 33 



Ei 



13 



33-51 



2-211 



— •140 



Apr. 8 



11 03 



D 2 



10 



34-74 



2519 



+ •168 



Apr. 8 



10 38 



Di 



10 



40-73 



2-681 



+ •330 



July 14 



2 52 



"1474" 



13 



45-28 



2-070 



— •281 



