IMAGE EVALUATION TEST TARGET (MT-3) fe r^ A, :/ i/. % 1.0 I.I 1.25 "^ 136 I 40 2.5 2.2 2.0 JA IIIII16 VI ^ /} A Photographic Sciences Corporation 33 WEST MAIN STREET WEBSTER, N.Y. 14580 (716) 872-4503 iV V rrtH A)le Star is visible ; prac- tically, at any lioin- froj^. .s^I^set ttr's^iliuise, sui'^irseding the ordinary tedious method of waitiifg for th^V>l()iTgftti?'>fe.- *!,(.. i,jost favorable times are in the early dawn and evening twilight, for the work can always be done more (juickly aii.l aceiuvitely by daylight than in the dark. Should the light be rather strong, and the star not easily seen, its place may be f(mnd, with a transit instrument, as follows : After levelling, turn the telescope (by deflection from the magnetic meridian) until it points true north, then direct it upwards at an angle equal to the latitude of the place, and it will point to the North Pole. The star should be somewhere in, or very near the Held of view. The obser- vation can then be made, and the Azinuith having been previously ascer- tained by the rule given below, the direction of the meridian or any other line can be immediately found. An error in the time will cause an error in the Azinmth, which will be greatest when the Pole Star is near the meridian; as an example: If the error of the watch is 1 m. * When the Pole Star is from the meridian, 0. 1. 2. ,S. 4. h 5. h 8. Error in Azimuth will be ()-o •4 -4 -2 1 Other errcjrs in the wat(!h will, of course, produce proportional errors in the Azinmth ; and the aimve example' will enable an observer to estim- ate the amount. There are various ways of determining the error of a watch ; the fol- lowing is suggested as a simple one: Observe the Pole Star at elongation; and with the Azinmth, lay off a true meridian line, and mark its position! A few hours later observe the star when at transit across this line. Note the exact time, and compare it with the true time of transit; the difference will be the eri-oi' of the watch. EXPLANATION OF THE TABLES. The Azimuths are given to the nearest tenth part of a minute from liat. 48° to 54* N. ' In calculating these Tables, a mean polar distance of 1°. 13'. 3Q", was used. The true polar distance is a va»able quantity ; and, at certain times of the year, the tabulated Azinmths will be slightly in error. A correction will then be necessary. This correction, with the dates, be- tween which it is to be used, will be found in the Auxiliary table, headed. Corrections to Azimuths. The culminations of Polaris have been calculated for a meridian 120° or 8 h. W. of Greenwicli, as being most convenient for use in British Colum- bia. Note that there are two Culminations on the 12th October:— In places to the Eastward, follow the instructions in the note at the foot of the Table. Ii t RULE FOR FINDING THE AZIMUTH. Find the interval between the time set for Observation, and the pre- ceding Culmination of Polaris. In the table opposite this Interval, and under the proper latitude, will be found the Azinmth of the Star, which, when necessary, nmst be modi- fled by the correcticjn. If the Interval is less than 11 h. 58 m., the Star's Azinmth is W. ; if greater, the Azimuth is E. Long. 8 h. W. of Greenwich. Culminations op thk North Pole Star. 1899. h. m. U 30 5 50 5 17 4 33 3 .54 3 15 2 43 2 4 1 24 41 2 11 22 10 43 10 4 9 25 8 42 p.m. 2 23 44 6 5 5 28 4 43 4 4 3 21 2 41 2 2 1 23 44 4 11 50 11 21 10 38 9 58 9 19 8 40 8 7 21 41 s. 20 .52 23 50 29 2 29 4 43 2.3 5 p.m. 48 a.m. ■M 20 8 2 52 43 34 25 17 13 3 .5;^ 48 34 20 5 49 53 57 35 19 58 35 10 44 17 49 p.m. Apr. Mav a.m p.m :) 1 Jan. 11 21 IFeb. 11 21 1 Mar. 11 21 1 11 21 1 11 21 1 Jun. 11 21 1 Jul. 11 21 1 Aug. 11 21 1 11 21 1 11 12 21 1 Nov. 11 21 1 Dec. 11 21 31 1900. Sept. Oct. h. m. 6 .37 5 58 5 18 4 .35 3 .58 3 16 2 45 2 5 1 28 42 3 11 24 10 45 10 5 9 26 8 43 8 4 7 25 6 46 8 5 27 4 44 4 5 3 26 2 4:^ 2 4 1 24 45 6 2 11 58 11 23 10 :« 10 9 21 8 41 8 2 7 22 6 43 p.m. s. .52 24 54 29 1 34 38 13 55 38 p.m. 20 a.m. 4 50 .38 32 22 12 4 46 42 33 23 16 4 51 'S6 19 24 28 6 .50 23 8 41 15 48 20 ca.m. p.m. p.m. In Long.: 7 h. W. Culmin'n, 10 seconds hiter " 6 h. W. " 20 oh. W. " 30 4 h. W. " 39 1(5 s M O 18 il "S > sti 5 09 g u 'Ji O) C6 4^ Op o s 9 5 Example in Lat. 50° N. h. m. s. KbRcr'n ( 7 30 a.m. 2 Dec. 1899 "^^^^ (_8_4(M0p.m.lDec. Interval, 10 49 50 Azimuth, 0^ .32-8 W. Correction, — -2 (Subtract.) g True Azimuth, 0° 32 -O W. Example in Lat. 54= N. h. m. s. ?or"ob^ern i 8 45 p.m. 1 July 1900 Interval, 13 58 56 True Azimuth, 1° l'-7 E. *"*• *'°.'''"'5 .*"^- quired.) Auxiliary Table. Corr'n to Azimuths Jun.July Aug. i89g, Add Nov.iSqq to I Apr. iQoo Sub Sep. Oct. 1900 Add Nov. Dec. 1900 double Add Interval 1 Corr'n Interval h. m. / h. m. 0-0 2;^ 50 1 •1 23 2 •3 22 3 •3 21 4 •4 20 5 •5 19 6 'i) 18 7 •5 17 8 •4 16 9 •3 15 10 •3 14 11 <.i 13 11 58 0-0 11 58 INTKRVAL SINCE Culmination, H. 2. 3. 3. 4- 4. M. 5 10 15 20 25 30 35 40 45 50 55 5 10 15 20 25 30 35 40 45 50 55 5 10 15 20 25 30 35 40 45 50 55 4 9 14 10 24 29 34 89 44 49 54 59 9 19 29 39 49 59 19 39 59 Azimuths op thr North Polk Star for 1898 and 1899, 49° LAT. 48° N, 2-5 4-9 7-4 ')•« 12-3 14.7 17-2 19-6 22-0 2ti 2({-8 29-2 31 •({ 34 '0 30-3 :«-6 40-9 431 45-4 47-6 49-8 52-0 541 56-3 i° 58-4 " 0-4 2-5 4-5 6-5 8-4 10-3 12-2 14-0 15-8 17-6 19-3 20-6 22-3 23-0 25-4 28-9 28-4 29-9 31-3 32-6 33-9 a51 36-3 38-6 40-6 42-5 441 45-8 46-9 48-7 49-8 50 ) 2-5 5-0 7-5 10.0 12-5 150 17-5 20-0 22-5 24-9 27-4 29-8 32-2 34-7 37-0 39-4 41.7 44-0 46-3 48.6 50-8 531 55-3 57-5 59-6 1-7 3-8 5-8 7-9 9-8 11-8 13-7 15-5 17-4 19-2 20-9 22-3 24-0 25 -fi 27-2 28-7 30-2 31-7 33-2 at -5 35 8 37-1 38-3 40-6 42-7 44-6 46-2 47-7 49-0 50-9 52-0 522 50° 51' ) 2-»t 5.1 7-6 10-2 12-8 15-4 17*0 20-5 2;^-0 25.5 28-0 30-5 32-9 a'rl 37-8 40-2 42-6 45-0 47 3 49-6 .'51 -0 54-2 56-5 ' 58-7 ' 0.9 3-0 51 7-2 9-3 11-3 13-3 15-2 17-1 19-0 20-8 22-6 24-0 25-7 27-4 29-0 30-6 32-1 .336 .351 30-5 37-8 39-1 40-4 42-7 44-8 46-7 48-5 50-0 .51-3 53-2 51-3 54-5 2-0 5-2 7-8 10-4 131 15-7 18-3 20-9 23-5 28-0 28-0 31-2 .33-8 38-2 38-7 41 1 43-6 46-0 48-4 50-7 53-1 .55-4 ■ .57-8 ' 0-0 2-2 4-4 8-8 8-7 10-8 12-9 14-9 16-9 18-8 20-7 22-6 24-5 25-8 27-8 29-3 30-0 32-8 34 1 a") -8 37-1 38-8 39-9 41-3 42-8 44-9 471 49-0 50-8 52-4 53-7 55.7 56-8 58-9 52° 0° 1° 2-7 5-4 8-1 10-7 ia4 16-1 18-8 21-4 24-0 26-8 29-3 31-9 at -4 37-0 »)-6 421 44-6 47-1 49-5 51-9 54-3 587 59-1 1-4 3-8 5-9 8-1 10-3 12-4 14-5 16-8 18-7 20-7 22-8 24-5 28-4 27-8 29-8 .31-3 33-0 34-7 36-3 37-8 39-3 40-8 42-2 43-8 44-9 47-3 49-5 51-8 53-3 54-9 56-3 .58-3 .■>9-4 1° 59-5 58° 54° 2-7 .55 8-3 11-0 13-7 16-5 19-2 21-9 2t8 27-3 .30-0 32-8 a5-3 37-0 40-5 43-1 45-7 48-2 50-7 53-2 55-8 0° 58-1 P 0-5 2-9 5-2 7-5 9-8 120 14.2 18.3 18-5 20-6 22-6 24-8 28-5 28-5 29-9 31-7 .as -5 a5-2 .38-9 38-6 40-1 41-7 43-2 44-8 48-0 47-4 49-8 52-1 51-1 I 58-0 i 57-6 1° .59-0 I 1-0 i 2'1 1 2-3 2° 1° 2° 2° 2° 2-8 5-7 8-5 11-3 141 18-9 19-7 22-5 25-2 28-0 30-7 a3-4 38-2 .38-8 41-5 44-1 46-8 49-4 52-0 .54-5 57-0 ' 59-5 ' 2-0 4-4 8-8 9-2 11-5 13-8 18-0 18-2 20-4 22-5 2t-8 28-7 28-7 30-6 a2-i 34-0 a5-8 37-6 39-3 41-0 42-6 44-2 45-7 47-2 48-6 50-0 52-5 54-8 56-9 .'58 -8 0-4 1-8 3-9 50 5-2 Interval SINOB Culmination. H. 23. 23. 22. M. 56 51 48 41 36 31 26 21 18 11 8 1 .58 51 48 41 31 26 21 16 11 6 22. 1 21. 5fJ 51 46 41 .36 31 26 21 16 11 6 1 56 52 47 42 37 82 27 22 17 12 7 2 .57 47 37 27 17 7 57 37 17 57 21. 20. 20. 19. 19. 18. 18. 17. Cu ■^ 4 T Interval BINC'K Culmination. H M. '£i 56 51 W 41 86 31 26 ) 21 16 J^ 11 ^ 6 23. 1 22. 51 46 41 86 81 26 21 16 11 6 1 j 22. 1 21. 56 46 ' 41 86 81 j 26 a 21 ^ P 16 ! 11 6 21. 1 no. 56 52 47 42 87 82 27 22 17 1 ». 2 0. 57 47 87 4 27 17 P- 5. 7 ,, 8. 57 ^» 37 I «. 17 1 H. 6 6 6 7 7 8 8 57 M. 50 19 :« 59 9 19 29 39 49 59 4 9 14 19 24 29 34 39 44 49 54 58 3 8 13 18 23 28 33 38 43 48 53 9 58 10 3 8 13 18 23 28 33 38 43 48 53 10 58 11 3 8 13 18 23 28 33 38 43 48 53 11 58 Azimuths op thk North Polk Star for 1899 and 1900. 54° LAT. 48° N. 49° 50° 51° 52° 53° 0° 50-0 49-3 47-9 45-5 441 42-5 40.0 ;S8-0 3(J-4 34 1 32-8 31-5 30-2 28-0 27-4 25-9 24-4 22-9 21-3 19-7 18-0 16-6 14-9 13-2 11-4 9-6 7-8 5-9 40 2-1 0-1 58-1 56-1 i>l-0 52-0 49-9 47-7 45-6 43-5- 41-3 39-1 36-9 34-7 32-4 30-2 27-9 25-6 23-3 210 18-7 16-4 141 11-7 9-4 7-1 1-7 2-3 0- 52-2 51-5 5(>-0 47-0 40-2 44-5 420 40-5 38-3 :S5-9 310 33-3 31-9 30-5 28-1 27-6 20-1 24-5 22-9 21-2 19-5 18-1 16-4 14-6 12-8 110 91 7-2 5-2 3-2 1-2 59-2 57-1 55-0 52-9 50-8 48-7 46-5 44-3 421 39-9 37-6 35-3 33-0 30-7 28-4 26-1 23-8 21-4 191 16-7 14-3 12-0 90 7-2 4-8 2-4 0- 1 54-5 1 5(J-9 53-8 i 5(J-2 52-2 r>i-7 49-8 , 52-2 48-3 ' 50-0 40-0 48-9 44-7 40-9 420 44-7 40-3 42-4 37-8 39-9 IMi-o 38-0 35-2 i 37 2 ;^:^-8 :S5-8 32-3 ; :i4-3 30-8 32-7 29-3 31-2 27-8 29-0 26-2 28-0 21-5 20-3 228 Jit -5 21 1 22-8 19-7 21-3 17-9 19-5 16-1 17-7 14-2 15-8 12-3 13-8 10-4 11-9 8-5 9-9 6-5 7-9 4-5 5-8 2-4 3-7 0-4 r 1-6 58-3 0° 59-5 56-1 57-3 54-0 551 51-8 52-9 49-6 50-6 47-4 48-4 45-2 461 42-9 43-8 40-6 ! 41-5 ;^8-3 39-1 36-0 36-8 :^3-7 34-4 314 32-0 29-0 29-6 26-6 27-2 21-2 2t-7 21-8 22-3 19-4 19-8 17-0 17-4 14-6 I 14-9 12-2 1 12-4 9-8 10-0 i 7-3 7-5 \ 1-9 5.0 2-4 2-5 0- 0° 0- i 1° 0° 5f)-5 5>';-8 57-2 ;■>!•({ 53-0 51.3 49-2 47-0 44-0 42-0 40-7 39-3 37-8 ;^0-3 31-7 ;«-2 315 20-8 28-1 26-3 24-6 231 21-2 19-3 17-4 15-4 13-4 11-4 9-3 7-2 5-1 2-9 0-7 58-5 56-3 54-0 51-7 49-4 471 44-8 42-4 40-0 37-6 351 32-7 30-2 27-8 25-3 22-8 20-3 17-7 15-2 12-7 101 7-6 51 2-5 1° 0° I 0° 2-3 1-5 " 59-8 57-2 55-0 5:^-8 51-7 49-4 40-0 44-4 4^^-0 41-0 40-1 ;«-5 36-9 35-3 319 30-1 28-3 28-5 25-0 2:^-1 211 19-2 17-1 151 13-0 10-9 8-7 6-6 4-3 21 59-8 57-5 55-2 52-9 50-5 48-1 45-8 43-3 40-9 38-4 35-9 33-4 30-9 28-6 25-8 23-3 20-7 18-1 15 '5 13-0 10-3 7-8 5-2 2-5 0- Intekval SINCE Culmination. 2 2° 1° 1° 0° fl° 5-2 4-4 2-6 0-0 ° 58-3 5(J-4 r>t-3 52-0 49-5 40-8 45-3 43-9 42-4 40-8 391 37-4 35-7 34-0 32-2 30-3 28-4 26-9 25-0 23 21-0 18-9 10-8 14-7 12-5 10-3 8-1 5-8 3-5 1-2 58-8 56-5 54-1 51-7 49-2 46-8 44-3 41-8 39-3 34-2 31-6 29-0 26-4 23-8 21-2 18-6 15-9 13-3 10-6 8-0 5-3 2-6 0- H. 17 17 16 16 15 15 14 14 13 13 12 12 11 M. 57 ifl 17 57 47 37 27 17 7 57 62 47 42 37 32 27 22 17 12 7 2 58 53 48 43 38 18 18 8 3 58 63 48 48 38 33 28 23 18 13 8 3 58 53 48 43 38 33 28 23 18 13 8 3 58