fez
-
- ;A .::;...
the
Cape
Mercury
" v;'
A-
.
'. "ft'ancrof;thc moon from -the ;fun. or' a fixcdlliodiacal ftalv : AsT': have T;farevcral' : vc irr : pVi'L "; ":
, ftance -of the moon from - the ftfn. or a fixed zodiacal
. made to loft, in order tp find my longitude,. "I can;, from fuch- ep u pcc.v:
" : r - :vcnt may always determine his. longitude- atfe by thU'mt..dtvuh ..i ;
. " ;. - witcn the moon is above the Horizon, "and "not jefs than 40 degreei' di ftarit 'fi.ihfunr except hen :
.:Prjiiclou
; 1 . : r v -rftkoningfov and :m6'ifc careful havt--
-::7T;::-;j-:-ators,;.can be furb he may not talUnto in the "'courIe76'logyvTriret6 be sillied this, metliod cf -.
VVbjTerring- the longitude was more practiced by matters' of Ihips. and others that uie the icir.then it no'.
' Jretroom to'fiope, by future improvements of. the lunar tables and inftrirments, that it will .be carried to "a
3?cJG!gncro.egre.c..of DCfjepo.
.rTiiererharlateV'bten-tublito-broH
rr-. the-naotkaKlmanacaiyironomlcal ephemerls, hich arc cdntai ri etV t li e d iltan ca of the: moon "f ro m
.. . ,rthefun rand fixcUftarslm-e
alfo rrur.y othtr ufefurtablcs .md inftriidions, whicK.have rendered this method of obfervinthe longitude . , r
at fca very pfain and cafy. Agreeable to yoiir reueft l here give you an example of an.obfervation . .
: Calculated by the tables of. the aftronomical ephemeris as it wai obferved a little without the barvat;m"j;
arrival here on the 22 cl of December laft; . ' 1 ;.: :- . "
'
the '2 id of December 'laft;
On board the Achtllci.- Manb i 1770. 1
ramv ore. ' '
JOHN WALKER':
-
U CALCyL"ATio&" .Z;;Q JlGdU'-pEy-'fnrx theJhfend'Dijlhce of the Moon and'Sun,en (hilt
- f r ' .... , , t -: r ' - ?r -
, " js Mil. Sc.
The. obrcrvcd DIftancc fcr thi Sii and Mocn's 7
" ncarcft L1mb$r - 59.- -Ji-o-
7 he cbfwvcd AUitOiJe tr.eSan's lo'vcfl Linib, ;i : 43 : 03,
1 he obferved Altitude o thrMooD' iewefi; Liab, 19-r-i 5r:co
1':
Da. Hon. Min. Se.
T-nnjituJe in by.AtfCflton't at tlie Time cf oiifcf vjr; w"
Lnmuuc irTat the Tirne of the Gtrtc.-tun,' 33 :4V . ,
Sun's JUccllDttioatf Tiine'cfObleivation, ty i'tH S.
') I'm" of OtferratloB 1? Grfcnnich. 1 , '-'
sccnuir.i. g for LoiTpimue, by Account s Dec. !4 s J7
Weil iiwr.i tiiat ajeudjan,
Time of Ob&fratfWV n WaK lift, : 12 : 50
.TrwfTiajcoftbcObirfuatioo. ciruO - " :, j
pated ficro ti.e Sua'i AluuJc, J JDec.siS, 23
rcJm tie cl cr-jtl D'rUr.ct of the .c.vv cx.l Mscn$ Llnirs, tr,tU apparent Eijtance cf their Ce't rs,
If alt'.ii'-gihe t(,mM&':ie$.it th Kun cv.l M:.cn, tvJ ts c'.e.ir the tfprtnt DijUr.cc of the Centers cftlc
I'ffRtt Lief rctliin ana I'tralhiy i'Mr. Dut:L:r;iSsTallest as Jcltem. . . , .t . :j.
Thf sr-arert Dlmce cf.tKe Sen anr' .ooal Center,
,li.r.n,ren AUituJe ti NJorr.'i Center, ' 1 : 2 : 7
D ffccrcecf the srf-rent A!iitcJc cf t!,c iJuoifid Mvon'i 7 , . .
Ccnten, ' 1
Cncf!i'ti ttbt V.jfttTi Ah.iiJe, f;cmTiUe 1 4, 4 1 '1" "c .9 ,
TehiQu?!! of the Sun'i A;:itadc, , ... , 1 : V J f 5
1). uter.ee of i."c ute Ah.uce ti'ihe Sun and Mocn 1 Center j, it t t
?ah't SerfltJbsr.eter,
Miu' l ten,
AjaiCi.ted jut Altitude,
Min. - Se.
16 : It
t
5
Mian's cort eT Scni .l.ane'er,
M-,. 1 H .t?m ! Par , '.. ec ; 7
-imiunic L);;Vertn;i; fiom Table :d, Hi.
7 ' .
M '. i; It
1 l : 5
J,M.J Ca c.,cn nn).C;rcr.fc ef sp-a:eat Alutuir,
;.j ril Co S;n tf ij-pifcu i;:.n;e,
i);ffctrcf t:tara2 Co 5 . - ,4
2.c:at:tbir..cDiefer. fr;n Tallc :d, fulir-ff, ,
Tre Kejl-irJf',- ' ' .' , . " . '
Ntm!f rT-rpcad;ij witli t Peri nder, . - .
Iia:urat Co bbui cf tie Differ ce of ucc AlUuJe, J'' n. ;a
4 t
1 i
4 4 ,
.1
r 5 -
4
)
5aitl