^ 



MR. RUMKERS OBSERVATIONS 



The three preceding' Solstices were obsei"ved partly by Sir T. Brisbane, and 

 partly by myself; but the Northern Solstice and Southern Solstice of 1823, 

 which follow, were exclusively observed by Sir T. Brisbane. 



1823. 



True meridian 

 Zenitli dist. of 

 Sun's centre, 



Reduction to 

 Solstice. 



Dec. 10 

 11 

 13 

 15 



18 

 20 

 22 

 24 

 26 

 27 



1824. 31 



Jan. 



r 



10 57 

 „ 52 

 „ 42 

 „ 34 

 ,, 25 

 „ 22 

 „ 21 

 „ 21 

 „ 23 

 ,, 25 

 „ 38 

 46 



45.2 



0.8 



16.9 



14.5 



41.1 



34.2 



1.4 



38.8 



51.1 



46.3 



2.4 



57.8 



•36 



31 



21 



13 



4 



1 











2 



4 



16 



-25 



37.8 

 3.0 

 14.8 

 16.3 

 47.8 

 29.3 

 3.6 

 30.4 

 52.3 

 45.2 

 58.0 

 53.7 



Com for 

 Sun*s 

 Lat. 



— 0.88 

 0.90 

 1.0 

 0.9 

 0.5 



— 0.25 

 + 0.05 

 + 0.26 

 + 0.37 

 + 0.30 



— 0.12 

 -0.26 



True Zenith 

 Dist. of Tropic 

 of Capricorn. 



10 21 

 „ 20 

 „ 21 

 „ 20 

 „ 20 

 „ 21 

 „ 20 

 „ 21 

 „ 20 

 » 21 

 » 21 

 „ 21 



6.56 

 56.90 



1.1 

 57.3 



52.77 

 4.65 



57.85 

 8.66 



5917 

 1.4 

 4.28 

 394 



Mean 10 21 1.21 



Luni-sol. nut., and Red" to Jan. 1, 1823 +2.81 



4.02 



M. Z. D. Tropic of Capricorn, Jan. 1, 1823 10 21 



From former observations, Mean zenith "1 _ ~ oc co 



dist. of Trop. of Cancer, Jan. 1, 1823./ -^7 ^o ^^^■^ 



Half difF. mean obliquity 23 27 41 .25 



Half sum latitude , 33 48 46.26 



The following Solstices have been observed by myself. 



Northern Solstice, June 1826. 



1826. 



True Meridian 

 Zenith Diet, of 

 Sun '8 Centre, 



Corr. for 



Sun's 

 Ijatitude. 



Reduction to 

 Solstice. 



True Zenith Dist. 



of Tropic of 



Cancer. 



Southern Solstice, December 1826. 



1826. 



True Meridian 

 Zenith Uist. of 

 Sun's Centre. 



Corr. for 

 Sun's La- 

 titude. 



Reduction to 

 Solstice. 



True Zenith Dist 



ofTropicof Ca. 



pricom. 



June 12 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 



July 1 



56 66 



57 3 

 „ 6 

 ., 9 

 ,. 11 

 „ 13 



,. 14 



„ 15 



„ 16 



„ 16 



„ 16 



„ 15 



„ 14 



„ 13 



,. 11 



,. 8 



„ 6 



56 59 



2.7 

 18.9 

 28.9 



6.9 

 23.4 

 14.6 

 41.0 

 39.3 

 14.3 

 26.3 

 12.8 

 34.9 

 30.1 



6.4 



9.0 

 51.6 

 13.8 

 26.6 



+ 0.5 

 0.4 

 0.4 

 0.2 



—0.1 

 0.1 

 0.2 

 0.4 

 0.5 

 0.6 

 0.7 

 0.8 

 0.8 

 0.8 

 0.8 

 0.7 

 0.6 



-0.4 



+ 20 24.9 

 13 2.4 

 9 58.2 

 7 18.7 

 5 3.8 

 3 13.3 

 1 47.9 

 47.0 

 11.2 

 0.0 

 13.7 

 62.1 



1 

 3 

 6 



7 

 10 



65.2 

 23.1 

 15.7 

 33.0 

 14.9 

 + 16 51.9 



57 16 28.1 



„ .. 21-7 



V » ^^-^ 



., ,. 27.1 



» ,1 27.8 



„ „ 28.7 



„ „ 25.9 



„ „ 25.0 



„ „ 25.7 



„ „ 25.8 



„ „ 26.2 



„ „ 24.5 



„ „ 28.7 



„ „ 23.9 



„ „ 23.9 



„ „ 28.1 



,. „ 18.1 



Dec. 1610 30 16.27 

 17 „ 27 33.47 



18 

 21 

 22 

 23 

 24 

 25 

 26 

 29 

 30 

 31 



25 25.36 

 21 24.38 



20 58.46 



21 7.72 



21 48.5 



22 53.35 

 24 28.4 

 31 43.95 

 35 14.46 

 39 10.50 



+ 0.66 



0.75 



0.83 



0.76 



0.67 



0.59 



0.45 



0.30 



0.29 



+ 0.25 



-0.11 



—0.48 



- 9 10.27 

 6 28.23 

 4 14.43 

 21.82 

 0.83 

 8.16 



43.82 



1 47.84 

 3 20.14 



10 46.61 



14 11.55 



-18 4.51 



10 21 

 „ 21 

 „ 21 

 „ 21 

 „ 20 

 „ 21 

 „ 21 

 „ 21 

 „ 21 

 „ 20 

 „ 21 

 „ 21 



6.66 

 5.99 



11.76 

 3.32 



58.30 

 0.05 

 5.13 

 5.81 

 7.97 



57.69 

 2.80 

 5.61 



Mean 



Luni-solar nutation and reduction 



10 21 



4.25 

 6.34 



10 20 67.91 



Mean 



Luni-solar nutation 



Reduction to Jan. 1, 1827 



Mean zenith distance of Tropic of Cancer 



From former observations mean zenith ^ 



distance of Tropic of Capricorn ) 



Half diff. mean obliquity, Jan. 1, 1827 ... 

 Half sum latitude 



67 



16 26.26 

 + 4.9 

 —0.2 



Mean zenith distance of Tropic of Ca- > 



pricorn, Jan. 1, 1827 5 



From last solstice, mean zenith distance } ^l-, to an nn 



of Tropic of Cancer, Jan. 1, 1827 J j ^^ ^" "^'^ 



57 16 30.95 

 10 21 1.6 



Half difference, mean obliquity 23 27 46.00 



Half sum latitude 33 48 43.80 



23 27 44.65 

 33 48 46.27 



