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ASTRONOMICAL PAPERS. 



31 



GtwtTO/ 'TABLE of the CON 'TACTS of the Limh <f ihc Sun .//vi Venus, as ohjerved 



ai NorrHon^ 'June yly I 769. Reduced to apparent Time, 



N J^. June 3d, (by the prccedinj; tiiblcs of the work) the Sun's center was on the meridian 

 at Ilh. 58^ 49'/ by the clock; and June 4th, at I ih. 59'. %^' , and thcrcrore gained at the rate of 

 13'^ui Z4lu)ur3. ilencc, at noon June 3d, the clock beiui*; i'. n^' How oi apparent time, fiie 

 was owly I^ 9". 48'" flow at the external conla(5l:, and l'. 9". 40'''' flow at the internal contut^. 

 But to avoid fradions, wc fay, i'. lo" flow at both contat^^s. Whence 



I'hc apparent tniic ot the Contadls, by different Obfervers, was 



External Contaift, 

 by Dr. Smith. 

 Firft vifdtSe iinpreflion ou 

 Q's limb, in form of a tre- 

 mulous pointed fliadow, at 



h. m. fee. 



%, 1%. 50to53 

 ."V well-defined bLick dent 

 in0'slimb, at 



a. 13. T5 



KxtcnKil Contad-, 



by Mr. Lukens. 



Mr. Lukens changing his 



field. 



Afmall dent in Q's limb, at 



h. m. i'ec. 



a. 13. 13 



F.JTternal Contact, 

 by Mr. Rittknuouse. 

 Firfl impreflion on Q's 

 limb) at h. m. fee. 



a. 12. 49 



Intei'nal Contat':l. 

 A thread of light, cloflng 

 round the darlt body of $ 

 rvith a tremulous motion, at 



h. m. fee, 



, _ a- 30- 15 

 The luminous thread be- 

 come clear and tjuiet in 12" 

 more, viz. at 



a. $0. %7 



lulcnuu Coiita6h 



Thread of light beginning' 

 to clofe round 5 '•^^■ 



h. m. fee. 

 2. 30. 8 



Thread of light feemcd, 

 complete, at a. 30. 24 



Internal Conta<^l. 



Apjicnranrc as in ]date 3^ 

 fig. 3, and judged by him for 

 the Coutatil, at 



h. m. fee. 



a. 29. SS 



When Venus was fully entered on the Sun's limb, and we had eompared 

 the difTcrcut papers on wliich our conta6ls were written down, and entered 



ihem in our bookj wc prepared for the micrometer and other obfcrvations. 

 Thofe of the micrometer reduced to apparent thiic, are as follow, viz. 



o 



o 



o 



< 



o 



B 



I 



2 



3 

 4 



S 

 6 



1 



9 

 10 



la 



14 



16 



17 



Apparent 

 time. 



June 3d, 

 1769. 



H.M.Stc. 



Mkromctcrmeafures 

 of.leafl dift:anee of 

 neareil limbs of Q 

 and % 



Value of 

 micromct. 

 mcafures; 

 orleafldill. 

 of limbs, in 

 jniu. and 

 fee. ofQ's 

 diameter. 



M. Sec. 



Parallaxes of 5 fromQ adjnfted 

 to tbctimcs of the micrometer 

 meafurcs, in order to the pro- 

 jei^ion; by Mr. Rittenhoufc. 



I. 

 I. 



%. 

 %. 



3- 

 4. 



5- 



5. 



5- 



5- 

 jr. 



5. 

 4. 



4. 

 3. 

 %' 



'i. 



45^4 



13.J 



8,6 

 46,67 



10,75 

 14,5 



15,3 



I3>i7 



2,93 



4.7 

 ^9,7 



18,58 



57,38 

 44,66 



32,47 



H,76 





In the 



Vertical. 



Seconds. 

 14,54 

 14,74 



I5,'^9 



15.77 

 16,17 



18,45 



I9>.^ 

 i9.J5i^ 



ao,36 



ao,5z 

 a 1,00 



ai,26 

 21,28 



ax, 29 



Tn Path 



of % 

 Seeonda. 



13,88 

 14,24 



14,9=^ 



I5»32 



17,45 



17,95 

 18,36 



18,64 



18,8 

 iS,95 

 19,06 

 19,21 



19,2?' 



19,15 

 19,12 



19,04 



19,0s 



Pfch^ahH 



Perpendi. 

 to Path. 

 Seconds. 



4,94 

 4,96 



5,<^i 

 5,13 



6,01 

 6,3a 



6,98 



7.48 

 7,67 



H,57 

 8,82 



9,14 



9,31 



9,49 

 9^56 





I 



r 





Diftance 



