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 I I 
 
DF.PART.M! NT OF Tlir: INTERIOR 
 (AN ADA 
 
 Hon. W. .1. Rorar, .VMii<i«r. W. \V. Cobt, C.M.O., Dfr%lt Miouur. 
 
 PUBLICATIONS 
 
 Dominion Observatory 
 
 OTTAWA 
 
 \V. F. King, C.M.G.. LL.D., Director. 
 
 Vol. II, No. 7 
 
 A Meteor Star Atlas 
 
 BT 
 
 KKVNOI.I) K. YOINC, Ph.D. 
 
 D 
 
 CAl 
 
 MT i.03 
 P02-07 
 
 OTTAWA 
 
 ( '.OVFUNMENT PrINTINC RuREAT 
 
 1915 
 
:i8Li0THE0'iE 
 
 ,, 
 
 DEPARTMENT OF THE INTERIOR 
 CANADA 
 
 Hon. W. J. linriir, Mmulrr. \V. \V. Curt, CMC, Drruiu Umnlfr 
 
 S^ 
 
 PUBLICATIONS 
 
 Dominion Observatory 
 
 OTTAWA 
 
 W. F. KiNc, C.M.G., LL.D., Director. 
 
 Vol. II, No. 7 
 
 A Meteor Star Atlas 
 
 REYNOLD K. YOUNG, Ph.D. 
 
 rsMc— 1 
 
 OTTAWA 
 Government PaiNTiNn Ruread 
 1915 
 
/ 
 
 
\ Ml ri(»i( >\\\{ \ 11 vs 
 
 n\ HI^MU l> K. Mil N(;. I'l,. I) 
 
 'I'lic follow iiit; set of twenty iii;i|)> is intfiMlcij to fjicililMtc the iili-crv Mlioii 
 of riiclcoi'- .111(1 the ploliiiin of ihiir |i;itlis. As is well known. I lie oli i'i\ cl 
 tiMck of a niclcor is nearly an arc of a t;rrat ciri-lc and i- I licrrforc 
 corni'iiii'ni l\ plotlcd on ;i nia|> wIhtc ^rc'it ciii-lcs ;irc rciirc-rnlcd liy ,-t r;iiu;lit 
 lines. 'I'lie accoiupaiiyinu; cliiirts are coiisl rucliMJ on llie K'loinoiiie or eeniial 
 prujeclion which };i\cs this desired property. 
 
 It is not e.'isy to calculate what aiimuiit of error will lie inlidduced \>y 
 usitiK a nia|) constructed tiy other projections, liecau.^e it \vill depend on 
 s('\cral factors: the fraction of th(> sk>' coMred liy one chart, the distance 
 of the meteor track from the radiant and also the particular ])rojectioii 
 used. It is safi' to sa.\-, iiowescr. that in nian\' cases the erroi- will lie 
 more than fi\-e dej^rees. that is to say that a path which has been correctly 
 ohserviMJ. if produceil hackward on a map with unsuitable projection, may 
 not pa>s within live dej^rees of the radiant. Of course the difliculty ari>iim 
 fiom projection may he eliminated liy iisinti a celestial nlolx- l>ut in general 
 a p;lol)e is awkward to handle. .\lso a record of observations would be 
 hard to preserve if plotted on Mieli a ^lobe. 
 
 The epocli is taken at I'.IOd. All stars t;iven in the Revised Har\ard 
 Pliotometry, volume fifty, as brighter than .")■() have been plotted. 
 X'ariables whose maxima are brifihter than .")■() lia\e been entered. The 
 size of the circles indicates the briiihtness of tlie stars. The >malle.-t 
 marked fi\'e indicates mafiiiiludes as faint or fainter than l-ti. Those 
 
 marked four indicate magnitudes lyinj; between I •") 4 ■ 1 and 41) ;M) 
 
 and so on. Those markeil zen, indicate magnitudes brighter than Otj. 
 In choosing; a scale for the representation of magnitudes, one has to bear in 
 mind that the r.-lative apparent briKlitness of the stars \aries from ni^iiit to 
 nij!;ht. The brifiht stars stand out relatively strong on a cli'ar moonliiiht 
 night, while on a nioonles.- nijiiit the immense nuiubi'r of faint stars 
 
UV2 
 
 iM 111 I" Mii>\K uh nil iin\ii\iii\ iiii-i.i(\ \ n>iM . 
 
 ^iMl.l,. nn.l.r- iIp' l-ri^l.t stars l.-ss .•.,.,s,,iru..iis. Tl.r .•l.-arii.ws „f ll,.. 
 
 ati,...>|.lK.,v Ml-.. all.Tts 111.' Mpp.Mnmn. of tlu- stni-. Tl..' L.-t • .mi, .1., 
 
 is tu Miik.' an !iv,Tau'.v A nnvur.A ;.|M«'anmn. ..f ihr n,:.|- i- mniv lunilv 
 .,|,,,i,,,,,.|„,,| ||- .,11 r..iiMrlhiiM.n l"Miii<!ancs aii-i star name- aiv oiiiitir,! ii 
 h:,.. l,.r..n.r s., U-ImmI Ilan-nM' h. ll.inK ..f llir Mars l.v nalin :,,„! 
 ,.„nM-llali..M. tl,:.i II UMMl.l M.ri.msly .l.iia.M Iron, il,.' .M'tnln.-^ -i Hm' 
 „,ap. t.. ..nut iIm-.' hannv-. Nrvrtlu-lrss i.oll.inn !,:.^ I--;: plnti.'.l ulnrl, 
 
 „;,. ,|,,i,„.,l u, nrr,.s-«ry an.l ulii'-li >ni'.'lH -' n-' i'"' "'='!'- '' 1" "-'■' 
 
 n-cuMun .•i.rlcs for .•vrry Ih.mi i.imI il,.' .l.rliiiat,..ii nn'l.- Tor r^ > ni, 
 .L.^nvs havr l-r.^n .lI•a^^n. In -I'l.-i m liiak.. the iva-lin:- -I i.nMtmn- Hon, 
 llu- maps .•asi.T. tl,r ini, nn.Miai<> p..-iii..ii- of tl..^ ri)iln n-r.„-io„ cirl,- I,,,- 
 ovorv turntv nninit,.- ;,n,l ihr .l.rlin.Mo,, .■i,rl,-s Inr cvrv liw .Ir..,.,- l,aM' 
 
 I,,,,,,,' i,„li,;,l,.,i Tlli- |.|or,,|mv a\o|,l- iIm ronln-inn \vlnrl, ,r,nlt~ II all 
 
 ill,. ,.iiv|(.-- :ili' ilrawn in lull. 
 
 i:,l Ii,. riiu,,il I'onvci lo wiiliin 
 
 iiiun~ nioic arcuiar\ r;,l, lie 
 ,ri,i;il, . :in.l lliin i-oiiipnlii|M; llir 
 
 I, j. lii,|M.l ll,al llic po-ilioli- NMll 111 ^I'liri: 
 
 ,„„.-,,„, I, ol ■ .l.rivr. In n:„ln^ <•! po-niun- inoiv arrmarv r;,n he 
 
 ,,|ii;iiiH .1 l'\ nica-niiim n i l:,ii-iil:ir ci 
 ,,.,1,, ;,MTn^in„ ai.l .Srlniatinn ilian l.v .-innatiim liir .li-t:<nr,- l,on, llir 
 n,.,d,l,u,,nnu lio,;i' aiul .Irrlni.iio,, rnvl,-, Jo,- tl,oM. who niav .h'^iv K. 
 ,.,„„|„ilr iIm' po~il,on^. III.' liiHlM,,! ,.r r,.n-i,Ur,|on ,.f ihc Miai.- alal ill.' 
 ('oii>taul- nM.j in ih.' i.i'o.irri ion ai.' onilmr.l. 
 
 |,-,„. ,i„..'ii'.'iiinp(.la.- map. iln' .'.IrMi;,! ~pli.iv i~ inia._in.'.l <'nt !>> a |.lan.' 
 ,,l,i,.|, m.ln.l.'^ a -.Lmi'iil ..I t!,.' ^.Ih'Iv -iMv .l."'iv,~ in .liamH.T. .\ny 
 ,,„i,„ n> ilii- Mnm.nl i~ pnM.T,,',! on il,.' plan.' i-y .M.inin^i ii to ll„' ('.'nliv 
 ,,,■ ,|„. -pliiiv. ■I'll.' noill, r.lr-iial polr liiav 1..' .':.ll."l iIk' avi- o| pn.jc.'I i..n. 
 •n„. |i,,h, aM-rn-iun .'in!,', :nv i,:ii.'l,i Im-- miilornilv ,li-i lil.iiK.l aroun.l 
 ,,^,, |„,|,, .,,,,1 ,i„, ,|,.,.li„:,ri..n .'inh- ninrn, .'iick'.. llic .li-tan<'c,~ from I'tr 
 jKilr li.'inL; liixcn l.\ ili<' loiiniila 
 
 ,■ = .")■:;:! cot 5. 
 
 while / i- till' lailiil- of till' .'iii'lo in ii 
 ,.ii-|.l( iiii'li'i' coii-iili rat ion. 
 
 (•Iii.> an.l rt i.< till' ilcclination of tlit- 
 
 F,,,. ,1„. ni'M six map-, tlir axi- of pioji'.'t ion lir- at plus I'oi-ty-fivo 
 dogroos ilii'linalion ami li^'hl a-i.'n-ii.n -iiri'i-iv.ly /ito hoiu'-, rour hours 
 
 Ii V..' rail till' a\i- of projection of any map the 
 
 ,t\veiil\ hoiU'-. 
 
\ SUIKMll >l \lt MI.Af*. 
 
 l(i:{ 
 
 I, ,t ,ii, (),) ill (•arlr>iiii; co-diilih.-ito, r l>ciii(j tlic iil)sciss!i mihI // i iif oniiiKitc. 
 rt ill.' clfcliimtinii of u .-l:ir and "n llir aimir liclwini iIm' Ihuh <Mi(lr |ia-.>iiiu 
 iliinimli ilir uxis of project lull :inil ili.ii (.!.<' pa-sinn iIikmi'^Ii iI.c m.h-. ihr 
 Inllow iiiLL irlalidh- li(i!il; 
 
 J = 
 
 ', :v.\\^ 2 
 
 .'/ = 
 
 • ;{;{ 
 
 Ian Id) cot n 
 sec ((/) + <i'l " 
 
 H«! in) —cot & 
 
 (2) 
 
 'I'lic cuilali'iii lu ihr imlil a-rriiMuii circli'^ is 
 
 tan CO .. .... I 
 
 V 2 
 
 anil I" llir (Irdili.ilidli cirrlcs 
 
 |.-)-;;:!-//|- - i:)-:i:5-t //p coto + •j.r-=o 
 
 i:\) 
 
 'I'lir a\i- 111' liKijrcti.MI Inj- till' IHAl ~cl ol >i\ liiap- lir- n;i the I'lUalnr 
 
 ami at liiilil a-i'(ii>iiiM>. /cM) lioiirs, four Imurs. . 
 -aiiic nciiaiiun. 
 
 .r=")-;>:5 Ian 'H) 
 
 1/ =_ .") . :>:| MM' I ii I Ian (). 
 
 'riic ciiiiarHin In tlic liulil a-c'cn.-iiiii i iiclc- is 
 
 .(■ = 7)SA tan i"i 
 
 anil 111 'ill' ilri'lin.'llinll ril'rlr- 
 
 //•' cot 5 — .'■■ - 1. ■)•:!;}) = 
 
 .a~ liclnll'. W it li llic 
 
 (5) 
 
 It)) 
 
 l< I 
 
 (8) 
 
 III i|,(. nr\l -li of -i\ niaj)- iln' a\i~ ol' |ii-c.jrri inn lir- at ininii- tmiy- 
 livc (Ic'iivo lit' ilri'linatiim ami llir nlatinn- air tin' -anic as fni- pin- liirl\- 
 fivc. 'I'lii' MUillii'iii riii'umiMMar map i- -iinilai' In ilir linrllitrn rin iiinpnlar 
 one. 'I'lic ciiMiiilinalr-- aiv mca-invil in imlic-. 'I'lir nicliiod of coinpuliiiK 
 the po-ition nf a point on tlir cli.-iit i)> inr.iii- of tlic I'ofcsoitig relations 
 will now lit' illii>tiatril liy an cxaniplc. 
 
1G4 
 
 ■I III. 11 \lln\> III' llii: DiiMlMiiN (iH-i;i;\ Al'iliV, 
 
 I,,,| i, I,,. ivi|uiiv,l to liii.i 111.' po^liinii <>|- ,,.\nrii< Irnin the first diMrt 
 
 ,,f ihr M.| ulH.^r aMs nl pn,;urti..n Ur< ;,I pli,> forly-tlvr .1,-nr, ,l..cru.uti<.n. 
 Hy nu:,^un..,H.n. /= --lU inrhcs. //--IM ii.Hu.>. Sul.Mitutiufi tl.e.e 
 \:tlur> ill fiiualioli (A) 
 
 I , ,-,. 1 'ii'i'i'l'i re ri 'lit ■i^ri'li^iiin til m Al'H'tlS IS 
 
 ._,•' !-.•_). I'.illHi •■.jiialion ill or ' '-' will n.iu serve to (Ictcrininc 6. 
 
 SiiliMimtiiiti in ■!• wr (ihlain o^+'s2 .)'.»'. 
 
 .,.,,,, ,„,„,< licai cMcHi.iMU- in i1h' imccdin- (■(luations ami also the 
 
 „,.aMuv.,irnt> in lli- rvainplr vvnv .■miipuir,! on iIh' l.asis of the widtli .if 
 
 1„. map- licin^ nin- iu.-iu-. Thr map- vary in si/..' to ~,.iuc cstri.t . and many ol 
 
 l„,n have liccim,' -lightly iliMortol in ilic proc(-. of ivpro.luction. I'rolml.ly 
 
 Ur iu-i nu'tlio,! K. pui-Mir ill atirm|iii^ii lo coniiiutc a position, is td lirst nicasmv 
 
 !,.,v,,an-ularro-or,rmalc- of the ncah'st intrrMrlioii of riiiht a>ccnsi(m and 
 
 ,|,.,r,naiioiM'irclr.. Thi- .•uinpnlat iu.i will -ivo the convrtion. if any. that siioul.l 
 
 1„. applied to thai p.oriion of the map to eliminate any error ari>inii; from ■! s- 
 
 liirtidii or >lirinka'4e of tin' paper. 
 
 I )iiniinioii ( )li-er\atory, 
 ( Mtiwa. 
 
 .March, llli:.. 
 
TbMti— 2 
 
rMKi 
 
7M M. ;; 
 
J