Circum-meridian Observations made at Makcrstown, 9th February 1 

 Glass Hoofs. 



Table I. ( Vol. IX. Pari /.-p. 233 J 



a order to determine the Latitude, and with a view of ascertaining the Accumcy that may be obtained by that Mode of Observing— LosciTtJDE in Time West of Greenwich, nearly 10\4". Quicksilver Horizon, covered by one ol Troughton's 



Noon by Chronometer. 



2 45 



3 36 

 147 



5 57 



6 40 



7 49 

 8S7 

 9 37 



10 33 

 1147 



12 45 



13 45 



14 40 



15 40 



7.09 

 5.21 

 4.28 



1.16 

 0.33 

 0.36 

 1.24 

 2.24 



6.32 

 7.27 

 8.27 



149.17 

 100.37 

 5G.20 



11.63 

 3.15 

 0.59 

 0.71 

 3.85 

 11.31 

 21,82 

 40.95 

 60.11 

 83.81 

 108.97 

 140.18 



Observed 

 Angles. 



3*8 31 40 



32 50 



33 30 

 84 10 



34 30 



35 00 

 35 10 

 35 05 

 35 00 

 34 50 

 34 40 

 34 30 

 34 20 

 34 00 

 33 40 

 33 20 

 32 30 



Altitudes corrected 

 for error of instru- 

 ment — 30" 



19 15 35 

 16 10 

 16 30 



16 50 



17 00 

 17 15 

 17 20 

 17 17 5 

 17 15 

 17 10 

 17 05 

 17 00 

 16 55 

 16 45 

 16 35 

 16 25 

 16 00 



Latitudes. 



Log/: 



Co-sine H Co-sine D 

 Sine (H + 13) 



55 34 21.0 

 34 15.5 

 84 22.5 

 34 13.1 

 34 11.8 

 34 05.8 

 31 06.6 

 34 11.2 

 34 14.5 

 84 18.3 

 34 20.3 

 34 19.5 

 34 14.3 

 84 14.0 

 34 11.0 

 34 07.1 

 34 15.0 



Mean, 55 34 14.2 



Formula for Logy 

 55 34 82 Co-sino 9.75229 



14 54 51 Co-sine 9.98512 



70 29 23 Ar. Co-sine 0.02568 

 9.76309 



© declination at noon Ephc 

 10° 4" west of Greenwich, 



Declination corrected for different meridians, 14 54 51.5 



Barometer, 

 Thermometer, 

 Zenith distance, 



For the refraction. 



29.40 = 0.7409 = 9.DK.'! 



47 8.33 = 0.0027 



70 2.2009 



42.7 70 



554.9 



_ 3 34.9 



Semi-diameter, + 16 14.0 



Numbers 

 Logaritlir 

 Constant factor, or Log./ 



sponding to horary angles 



©'s declination corrected for different meridians, 

 s for horary angles, 



Attitudes corrected for error of instrument, 

 Semi-diameter + Parallax — Refraction 

 Refraction to noon, 



149.17 

 2.17363 

 9.76309 



1.93G77 



56.20 

 1.74974 

 9.76309 



39.17 25.68 



1.59295 1.40960 



9.76309 9.76309 



11.63 

 1.06558 

 9.76309 



Mean of 17 Latitudes = 55 34 14.2 



' H becomes — D when tha Sun or Star is North of the Equator 



