11 



SECULAR PERIODICITY 



THE 



I 



7 



9 



14 



24 



27 



CATALOGUE OF AURORAS.* 



Compiled from Professor Winthrop's Journal. 



1742. 



1 Doc. 29 

 2 



A -mall northern light this evening. 



" 30. (11 h , P. M.) A faint appearance of the 



31 



northern light. 



1743. 



32 May 11 



3 Jan. 23. (ll h , P. M.) A considerable northern 



1 Nov. 5. 



5 Mar. 12 



U 



« 



29 

 8 June 12 



a 



15. 



light. 

 A northern light in the evening. 



1744-5, None. 



1746. 



Evening. A considerable northern light. 



Northern light. 

 About midnight a northern light. 

 Evening. 



realis. 

 Evening. 



37 



°9 



41 



13. (1 If, P.M.) 



A considerable Aurora Bo- 



43 



Aurora Borealis. 



10 July 4. Aurora Borealis from ll£ h to 6£ h - 



11 Dec. 14 



Evening. 



Small Aurora Borealis. 



1747. 



12 Jan. 9. Evening. Small Aurora Boreali 



13 Feb. 6. Evening. Aurora Borealis. 



Aurora Borealis. 

 Small Aurora. 

 An Aurora Borealis. 



47 



7. 



15 May 29. 



16 July 5. 



Evening. 

 Evening. 

 Morning. 



1 7 Aug. 29. 



18 « 30. 



19 Sept. 5. 



20 « 27. 



Evening. A small Aurora Borealis. 



Great Aurora Borealis. 



Morning. 

 Evening. 

 Evening. 



Aurora Borealis. 

 Aurora Borealis. 



21 Dec. 26. (10 h , P. M.) A small Aurora Borealis 



56 

 57 



22 Feb. 3 



1748. 

 (10*>, P. M.) Aurora Borealis 



23 April 7. Evening. Aurora Borealis. 



Aug. 30 



Evening. Aurora Borealis. 



25 Nov. 1. Evening. Aurora Borealis. 



26 Dec. 15. Evening. Aurora Borealis. 



« 



20. E 



vening. 



Aurora Borealis 



1749. 



28 Feb. 16. (1 0^, P.M.) Small Aurora Borealis 



29 March 9. 



30 April 5. 



« 



18. 



Evening. 

 Evening. 

 Evening. 



Aurora Borealis. 

 Aurora Borealis. 

 Small Aurora Borealis. 



65 



Evening. 



Aurora Borealis. 



33 June 7. (10£ h , P. M.) Aurora Borealis. 



34 Sept. 13. 



35 Oct. 18. 



36 Nov. 6. 



Evening. 



Small Aurora Borealis. 



M 



U 



9. 



Evening. 

 Evening, 



Aurora Borealis. 

 Small Aurora Borealis. 



1750. 



38 Jan. 5. Evening. Small Aurora Borealis, 



.. 



6. Aurora Borealis. 



40 Feb. 4. (10£ h , P.M.) Small Aurora Borealis. 



.. 



27. 



Evening. 



Great Aurora Borealis. 



42 Mar. 4. Aurora Borealis. 



a 



11. 



44 April 8. 



45 " 



46 « 



Evening. 

 Evening. 



Small Aurora Borealis. 

 Small Aurora Borealis, 



44 9. Evening. Aurora Borealis. 



44 14. (7f h , P. M.) Considerable Aurora 



Borealis. 

 44 30. (After 8| h , P. M.) Aurora Borealis. 



48 May 1. 



49 July 26. 

 50 

 51 



Evening. 

 Evening, 



Aurora Borealis. 

 Aurora Borealis. 



Aug. 



28. Evening. Aurora Borealis. 

 26. Evening. Aurora Borealis. 



52 Sept. 4. Evening. Aurora Borealis. 



53 Nov. 2. 



54 « 



Evening. 



O 



Bright Aurora Borealis. 



4. (6£ h , P. M.) Aurora Borealis. 



1751. 



55 Feb. 12. (8 h , P. M.) Aurora Borealis. 



u 



« 



19. 



24. 



Evening. 

 Evening. 



Aurora Borealis. 

 Aurora Borealis. 



58 April 2. Evening. Aurora Borealis. 



59 June 27. (ll| h , P. M.) Aurora Borealis* 



1752. 



60 Jan. 19. Evening. Bright Aurora Borealis. 



61 Oct. 12. (84>, P. M.) Aurora Borealis. 



1753. 



62 April 30. (10^ h , P. M.) Aurora Borealis. 



1754-6, None. 



1757. 



63 Aug. 13 



64 Sept. 7 



« 



13 



Evening. 

 Evening. 

 Evening. 



Aurora Borealis. 

 Small Aurora Borealis. 

 Small Aurora Borealis. 



All the dates are reduced to new style, 



* 



