None
49-69 J7 i v * v ' " 49-69 *" J ** -1-51 2 1540 1310 — O'OI I ... ... ... 21-14 — 2-06 3 1587 1387 — 0-08 2 ... ... 24-51 — 0-19 4 ... 1869 1651 + 0-30 I ... ... 38-76 4-2'OQ 3 ... ... 1976 • 767 — 0-05 3 56-89 + 0-39 3 2050 181; + 0-08 3 +0-04 4 4-45 -0-55 12 4-88 — O'I2 12 2080 1838 +0-06 i 24-21 + 2-01 3 ... 2115 1868 — 0-05 3 ... i'45 + 075 2 ... ... H72 2243 + 0-13 3 ... 9'43 + 0-63 4 ... 2922 2512 39-90 + O-20 2 2924 2513 + 0-05 2 5-97 -0-73 I 3553 2845 — 0-06 i -°'33 I 24-83 + 0-03 4 25-58 +0-78 5 3839 2987 ... (+0-64) (0 59-07 -f 0-17 3 40 123 62 ... + 0-03 2 ... 5379 +0-09 3 150 83 +0-14 i + 0-03 2 «3'42 + 0-52 2 13-06 +0-16 2 372 227 — o-n 2 24-25 -I'35 I 24-38 — I'22 4 389 238 — 0-07 2 — 0*04 2 8-16 +0-16 2 Til -0-2J 2 498 324 — 0-07 I + 0'OI 2 39-30 + 0-30 I 39''7 + 0- 17 3 507 33' -0-35 I + 0-09 2 45-97 —0'73 I 47-35 + 0-6j 3 509 334 + 0-03 I — 0-03 3 22-83 + 2-33 1 21-03 + 0-53 4 SH 337 — o-io I -0-15 2 17-56 + 1-46 I 15-82 -0-28 3 637 452 ... +0-05 2 ... 5-22 — 0-18 \ 640 455 + 0'O2 I + 0-09 2 36-89 — 1-01 2 36-19 -1-71 6 650 464 + 0-03 2 + 0-05 3 33-81 -0-39 6 34-09 — O'll 9 777 549 + 0-04 I — 0-09 2 38-92 — 0-48 2 39-66 +0-26 4 1016 815 — 0'50 I — 0-07 2 20-73 + 0-63 I 21-39 + 1-29 i 1147 926 + o-o6 I — 0-07 I 51-27 + 0-77 2 52-00 + 1-50 2 Ixxiv INTRODUCTION TO GROOMBEIDGE CATALOGUE. Comparison between Groombridge and Bradley — continued. d to d R. A. N.P.I >. N.P.D. Groombridgt £; * 1 « Groombr. East- Bradley. *i a .y "5 ^ Groombr. West- Bradley. Til V Seconds of Groombr. East, iSio'o. Groombr. East- Bradley. J3 .SO '« £ Seconds of Groombr. West, iSio'o. Groombr. West- Bradley. rf i O 8 3 // // // „ 40 1309 1066 + O'O6 2 ... 33'36 -074 4 IQ2Q 1712 4.v6o — O'l I J i y *y 2015 / 1791 ... -0-25 3 T j ^y J 3i-3i -0-79 4 2155 1902 + 0-05 I 34-90 + 0-60 I ... 2ac? 2107 13 68 + 0-68 I j j j 2368 / 2128 J 41-61 — 0-70 i *• j "*•' 2894 2496 — 0-27 I ... ... T / 7 j 2895 2498 — 0-14 3 — O'Og 3 49^4 + 0-04 15 49' '3 -0-17 '5 3°'7 2570 4-0-01 3 ... 9-03 — 0-67 5 3264 2683 . .. + 0-26 i 15-71 + 042I 4 3799 2975 + 0-05 i — O'lO i 28-30 — O'20 6 28-47 — O-O3 6 3972 3052 + 0-34 i + 0-07 2 43-18 + 0-78 i 43-18 + 1-08 3 41 ii 3'46 + 0-29 i — 0-05 2 45-24 -I76 i 47-06 + 0-06 2 4' 420 261 — 0-29 i -0-17 2 50-52 + 0-32 i 51-16 + 0-96 2 545 374 ••• — 0'2O 2 2-09 — 0-6 1 10 2'75 + 0-05 8 668 4.76 3Q-q8 + O'i8 « 681 T / 478* — 0-02 2 — 0-07 2 39'54 + i'94 3 J 7 7 38-68 + 1-08 5 1094 886 — 0-05 I 58-22 ( + 4-52) (») 122O 984 -0-15 I 3 H5 1 4- I'll 2 1379 1 126 + 0-15 3 ... 21-65 + o'55 2 ... 1492 1260 ... + 0'I I I 18-44 — 0-36 I 17-99 — 0-81 "a 1823 1600 — 0-09 2 2-37 -1-03 6 2'37 -1-03 3 2183 1923 — 0-14 3 4'47 -0-43 i ... 2188 1925 + 0-09 I ... ... 2440 221 I ... -0-08 2 ... 30^9 + 0-99 3 2448 2227 ... 4-o-15 3 55-16 4-0-66 4 *474 2244 4-0-20 3 + 0-08 2 56-63 -1-17 3 5690 — 0-90 i 3186 2639 o-oo 2 -0-23 I 3 1 'oo O'OO 3 32-06 + 1-06 2 3201 2645 — O'O 3 ... 56-04 — 0-36 5 ... 3210 2647 + 0-19 i — 0-02 3 sr»s -1-15 2 57-69 — 0-61 3 3567 2855 ... — O'OI 2 ... ... 56-37 -o-33 5 3764 2958 O'OO i 0-49 -0-51 2 ... 3989 3064 ... + 0'C2 2 1378 + 0-38 2 401 1 3°75 — 0-07 2 46-98 — I -02 3 47-7I — 0-29 4 4* '32 69 + 0-06 2 O'OO 2 28-90 + I-IO 2 26-02 -1-78  0-04 4 686 479 + 0'20 I + 0'IO 3 21-68 + 2-08 i 20-17 +°'57 3 687 480 ... ... +0-05 2 ... 3972 + 0-52 2 694 • 483 — 0-08 I — O'lO I ... ... 707 488 — 0-04 2 + 0'I2 2 3-85 +0-75 3 3V38 + 0-25 3 722 499 -0-27 2 — 0'08 3 53-97 — 0-63 15 54-09 -0-51 '4 781 557 — 0-06 3 28-19 + 0-39 5 ... 793 564 +0-15 2 — 0-14 3 11-55 +0-05 15 II-30 — O-20 10 1056 861 — 0-28 I — 0-06 i 35'96 + 3-76 i 32^6 + 0-76 2 1378 1125 — 0-14 3 — O'I2 2 8-22 + I"O2 i 8-21 + roi I Adopted seconds of Bradley N.P.D., 1810-0, J7"'6o. COMPARISON OF CATALOGUES. Ixxv Comparison between Groombridge and Bradley — continued. X.P.D. Groombridge No. 0 to 1 R.A. N.P.D. Groombr. East- Bradley. .y Groombr. West- Bradley. i 8 Seconds of Groombr. East, 1 8 10*0. Groombr. East- Bradley. 1 Seconds of Groombr. West. iSio'o. Groombr. West- Bradley. *a> 0 8 8 ,, „ rt 4* 1503 1272 o-oo I 5'8l 40'2I 9 6-16 40-56 6 1811 1589 — O'OI 1 46-79 -I-8I i 1833 1609 —0*19 3 59 10 40-50 i T • J 1834 1610 —0*31 i 3108 2612 — 0-O9 i -0*13 2 50-83 -I-I7 2 52-16 40-16 2 4026 3089 ... ... 4o-oi 2 t • I 1 6 40 —0*60 3 4°35 3°93 — 0*O9 i 40-05 I 85-13 40-93 2 55-59 + 1-39 i 4036 3°94 -0-15 i ... 43 252 >34 ... — 0-14 2 ... 29-89 40*79 3 324 196 + 0-05 2 — 0-03 I 38-91 — 0-29 3 37-86 -''34 i 495 3'9 40-16 2 ..-. •4'59 40-39 3 499 325 40-23 I ... 10-25 -0-75 i 817 577 ... — 0-02 2 ... 6-85 40-85 4 945 721 -0-04 I — 0-08 2 ... 1125 905 ... -0-24 I 41-50 4*'io i  + 0*08 I ... 14-85 41-05 4 • • > 3091 2603 — O*IO 2 40*01 2 46-46 -0*94 6 47-68 +0*28 2 3362 2732 + 0'2O I 40-19 I 57-17 -o-33 3 57-56 40*06 I 3394 2750 40-08 2 j.. 36-98 — o 62 4 3787 2970 -fO'12 I — O'Zl 1 43*11 — 1-69 2 45-40 40*60 2 44 3 3220 + 0-26 2 40-09 I 7*66 -0-14 3 9'75 41-95 , 128 67 -0*I5 I 40-14 2 0-62 -0-28 i 40-57 2 697 484 ... 40-12 3 • * • 53'8z 40*32 3 946 722 35*89 -0-71 15 35^4 -1-16 15 1243 1006 — 0-24 I -0-25 2 23-40 — 2-1O 2 24-59 — 0*91 3 1578 1367 — 0-12 2 — 0'12 2 37-55 40-I5 2 36-15 -1*25 2 1741 1542 -0-I7 2 — O*IO 3 22-22 — 0-38 8 22-23 — 0-37 c 2137 1878 4-0-08 2 12-38 4I-28 i f 2311 2061 40-97 40-07 2 3299 2699 ... O'OO 3 ... 9-08 40-28 1 3366 2735 40-09 I 40-11 2 8 -8 1 + I-I1 I 8-n 40-41 J 2 3459 2792 — 0*28 I ... 14-20 — I'2O i 347* 2799 .. — O-02 2 3378 — O'I2 4. 3747 2948 — 0-16 i 40-32 I 59-05 -175 2 59-35 -1-45 T 2 Ixxvi INTRODUCTION TO GROOMBRIDGE CATALOGUE. Comparison betiueen Groombridge and Bradley — continued. N.P.D. Groombridge No. d £ £ ry OS £ R.A. N.P.D. Groorabr. East- Bradley. -ti § 8 £ Groombr. West- Bradley. *J J3 S»0 1 Seconds of Groombr. East, i S i o'o. Groombr. East— Bradley, +! S 8 Seconds of Groombr. West, 1810*0. Groombr. West- Bradley. S i 0 s 8 „ ir „ ti 44 3985 3060 -0-24 I ... . .. • •. ... ... . • « , .. 3988 3063 + 0-IJ z ... ... 13-07 — 0-63 2 4106 3H3 + 0-09 2 O'OO 2 I 2 'O6 -1-04 2 11-91 -I-I9 4 4'37 3163 ... — 0-05 3 ... No — 0-90 5 45 300 177 — 0-07 2 + 0-43 i 15-72 + P22 3 i5'3« + 0-8I i 312 186 — 0-04 2 43-83 -0-27 3 ... ... 617 438 — 0-03 3 20-48 -0-32 6 21-06 + 0-26 6 1050 859 + 0-09 i + 0-18 i 12-44 — 0-26 9 11-89 — 0-81 8 1206 973 + 0-03 2 -0-14 2 28-44 + 1-24 3 27-22 + 0-02 2 '474 1247 — 0-04 I — 0-04 I 34-23 -0-37 3 35-33 + 0-73 2 1703 1 510 ... — 0-16 2 6-05 -0-45 4 6-32 — 0-18 5 »773 '559 — O'o6 3 36-67 + 1793 574 — 0-30 2 ... 577 + OM7 2 ... ... 1810 1588 -0-13 3 ... 1922 -1-172 3 ... 1847 1621 + 0'12 3 1-24 + 1-24 3 ... 2316 2068 I'CO + I -60 i 2932 2520 — O-04 2 — O'OI 3 37 38-21 + 0-51 3 37-66 — 0-04 5 3257 2679 *6"4.1 — O'O7 16 J 3495 2810 ... +0-03 2 J w T J / J J 37-08 — PIZ 9 46 355 218 -0-14 1 — O-26 6-91 + 0-31 2 7-88 + 1-28 i 468 300 — 0-07 2 — 0-16 O'lO + I-2O 2 0-6 1 + 171 i 546 376 ... — 0-05 ... 10-81 + 2'2I 2 636 453 + 0'08 I o-oo 0-82 + 072 I 1-32 + I'22 2 910 690 + O-IQ 3 + o-o6 18'57 + 0'57 II 19-04 + I'°4 6 1065 865 — O'Ol 2 ... ... 1218 985 — 0-09 I -0-17 5^55 + 0-25 2 5382 + I-52 2 1405 "155 ... . + 0-17 23-89 + PI9 2 '45° 1183 + 0-03 I + 0-26 50-67 + 1-07 3 5''23 + I-63 I 1524 1295 ... + 0-13 2 27-78 — P02 4 1629 1421 — 0-09 3 30-88 + 0-28 's 31-32 + 0-72 6 1881 1660 + 0'02 2 ... I4-I9 + 2-19 3 ... '... 2289 2025 ... + 0-05 i 7-41 + 0-9I 2 2291 2028 ... .. ... 3°-5> + I-4I i ... 2717 2389 . .. -0-13 2 ... 330° 2702 — O'I4 3 + 0-07 3 3V65 -0-55 4 5-10 + 0-90 4 3317 2710 + 0-03 i — 0-13 i 38-62 + 1-02 2 39-00 + P40 2 3323 2712 — 0-14 i ... ... . .. ... ... 3385 2746 + 0-03 3 ... ... 30-39 + 0-09 10 3072 + 0-42 8 3427 2775 + 0-10 2 ... ... 3851 2995 — 0-07 i O'OO I 45>7 + 0-97 2 45-65 + i-I5 3 4118 3H9 — o-oi 2 +0-03 3 1-48 — I -O2 8 2-16 -0-34 4 47 40 '3 — 0-03 2 + 0-01 i 53-07 -071 2 53-82 + 0'02 i 246 129 + 0-OI I +0-03 2 25-54 + 0-84 I 25-40 + 070 3 647 458 +0-04 I j — O'll 2 3-48 + 0-98 I 2-91 + 0-41 3 839 616 ... +0-I7 I ... ... ... I COMPARISON OF CATALOGUES. Ixxvii Comparison between Groombridge and Bradley — continued. N.P.D. Groombridge No. 0 ft fe R.A. N.P.D. Groombr. East- Bradley. 4 t Groombr. West- Bradley. «J 1 £ Seconds of Groombr. East, iSio'o. Groombr. East- Bradley. it ji .» 1 Seconds of Groombr. West, iSio'o. Groombr. West- Bradley. *! I £ o s 8 it n it if 47 840 618 ... — 0-07 2 ... ... . ,, 18-21 -0-49 I 867 644 + 0-15 4 38-94 + 1-24 3 1067 868 + 0-09 2 +0-07 2 49'95 + 0-65 i 50-29 + 0-99 I 1071 873 — 0-07 — o-i i 1 7'3* — O"O2 I 8-08 +078 i 1199 965 O'OO — o'04 I 30-15 + 0-25 2 30-1 1 + 0-21 2 1411 "59 -0-23 . .. ..• . .. ... ... •495 1268 + 0-23 + O-IO 2 27-28 + 0-88 2 26-61 + O'2I 2 1639 1430 — 0-04 4-19 -4-0-29 2 ... • • • 1641 '433 — O'O2 2 . .. . .. ... ... 1642 '434 ... •fo-o; 3 59'H — 0-56 8 59-22 — 0-58 7 1905 1686 — 0-16 2 — 0-09 2 3070 +0-50 2 30-93 + 073 2 2284 2O2I + 0-04 2 ... . .. 37'*7 -o-33 2 ... 2348 2IO2 .. — 0-22 I ... 39'33 -I-I7 2 2358 2113 ... . .. — O'l I 3 * •• ... 53'3* + 0-32 3 2905 2503 + 0-09 3 ... 54-64 — 0-56 2 3534 2826 . •* + 0-19 I ... 3'47 — O-OJ 3 3792 297I + 0-05 2 ... • •• 50-86 +0-16 I 39°7 3023 + 0-07 1 40-24 -0-86 2 ... ... 3999 3070 — 0-07 3 -0-24 2 29-00 — 0-20 2 28-48 -0-72 I 4109 3 '44 — O-01 3 58-23 -0-01 3 58-23 -0-01 4 48 256 '43 — 0'21 i 56-68 + 0-58 i 447 276 — 0-02 2 17-60 — 0-50 5 '775 -0-35 5 728 506 — 0'26 2 — O-26 I 59-29 + 0'59 3 59-97 + 1-27 i 959 740 + 0-09 3 + CCIO 2 59'3 + 0-82 2 59-09 + 0-59 i I 22J. QQ2 2 1*C * -I-O'22 2 ic-yy 4- 1-4-7 i T 1289 77 lOJZ — 0'05 i — 0-09 I JT 7 * 3376 i w " *" — 0-04 2 j it 33-92 1 T/ + 0'12 i 1307 1064 — o-io 3 30-89 — I'OI 2 1565 1346 ... -0-13 2 ... 51'62 -0-78 2 1592 '392 -0-25 3 44-85 -2-05 3 • •• 1718 1522 + O'02 3 ... ... 1864 1640 +0-17 — 0-16 1 53-05 + 0-95 2 53'15 + I-05 I 1912 1696 + 0-01 2 — 0-09 I 4089 — ro i 2 42-53 + 0-63 I 1966 '753 — 0-18 I 39'3 4- I'll 2 ... '973 1759 — 0-08 2 ... 17-36 -0-14 2 ... '975 1765 — 0-03 3 ... 26-63 + 0-63 2 ... 1978 1769 — 0-04 3 ... 55-83 + 0-13 2 ... 2178 1918 + 0-16 2 — 0'O2 2 15 22 — 0-38 3 14-63 -0-97 3 2242 1965 + 0-05 2 ... 4779 + 0-19 i ... 4779 + 0-19 i ... 3954 3°43 — 0-08 4 ... 3954 3°43 — 0-08 4 ... 32-00 — 2-00 3 3958 3°45 -o i; 2 -0-17 i 42-07 -073 i 43-03 + 0-23 i 4°37 3°95 — 0-03 I +0-11 i 38-83 + 0-13 i 37-45 -1-25 i 4065 3118 -0-15 2 5874 + 0-14 3 +9 152 87 — 004 i ... 29-05 -0-95 2 30-16 + 0-16 i 222 1 08 + 0-01 2 .. * 45'42 -0-28 i 6l5 436 ... +0-05 2 8-97 -1-33 I 8-70 — I '60 3 Ixxviii INTRODUCTION TO GROOMBRIDGE CATALOGUE. Comparison between Groombridge and Bradley — continued. N.P.D. Groombridge No. o fc fe-ll K.A. N.P.D. Groombridge. East- Bradley. Groombr. West- Bradley. Seconds of Groombr. West, 1 8 1 o'o. Groombr. East- Bradley. Seconds of Groombr. East, 1810"o. Groombr. West- Bradley 49 850 626 8 2 19-80 — O'lO 2 912 693 + 0-08 2 0-07 3. S5'°7 -'43 4 55-12 -i-38 5 925 700 + 0'02 2 0-01 2 10-89 — 0-41 10 10-15 -1-15 10 1198 964 — O'Og 2 54-24 — 1 -06 2 '574 '354 + O'lg I — O'lg I -0-17 I o 89 — 0'2I i 1582 '374 + 0-02 2 24-70 -2-50 2 1725 1524 — 0-05 3 ... 13-56 -°34 2 1786 1571 -0-15 2 ... 7-07 -1-23 2 1890 1664 + 0-04 1 — O'l I 2 34-03 -0-97 I 33-83 — I-17 I 1921 1705 — o-o i I 13-53 + 0-03 2 ... 2173 1914 (-o-53) (O . ... 3177 -0-43 2 • •• ... 2256 1982 + 0-15 3 ... 18-22 -0-48 I 2479 2245 I O*66 -1-6.1 \lf 2484 T J 2248 + 0-03 I * •. 57-29 i 04 -1-71 2 3125 2618 + 0-05 i 15-52 -7*68 2 3338 2724 — O'OI 2 32-72 -1-28 3 3555 2841 + O'I 1 2 32-47 -2-83 I 3871 3005 — 0'29 I . * • 30-37 -0-23 2 3898 3018 — o-ii 2 3926 3°34 -0-14 1 -0-23 I 27-81 -1-29 I 29-24 + 0-24 I 4028 3091 — 0-07 ' ... 44-91 -0-29 2 5° 20 2 -0-13 I — 0-03 1 5077 -1-73 2 50-23 -2-27 2 124 64 +0-13 I ... 36l 221 +0-03 3 24-27 -0- 93 2 396 244 — O'O I 3 49-49 + 0-59 2 ... 401 250 4-00 -2-23 I ... 542 37' — 0-04 i — o-o i 2 4'47 -o-33 I 4-01 -0-79 2 765 539 — O'l I 2 — 0-07 3 4-49 + 0-09 4 3'59 — 0-81 3 798 565 — 0-07 3 — 0-63 3 906 687 O'OO 3 ... 25-32 — 0-08 i ... 907 688 — 0-04 2 48-50 + 1-00 i ' 954 73' — O'OI 2 2-75 +0-05 2 ... 1023 827 ... — 0-07 3 48-99 — I-2I 1 1025 829 — 0-20 5 52-66 -0-84 3 1028 840 — 0-14 3 17-29 — 2-01 2 ... 1 196 963 +0-08 2 20-40 -)-70 2 1229 999 5-88 + ri8 I 1273 777 1032 — 0-04 3 ... -0-14 2 1652 '455 ... -0-08 4 24-70 -1-70 2 '733 '532 '532 — 0-08 3 16-51 4-1-81 2 1764 '555 + 0-12 3 26-02 -0-78 2 ... '935 1725 -0-25 2 — 0'02 2 11-28 -0-42 I 10-96 -0-74 I 1962 '749 — 0-16 2 2-98 — 0-62 1 1963 1750 — 0-21 I 39-89 -1-91 I • •. 1964 1751 — O'l I 3 '774 — 0-96 2 2120 1871 — 0-07 2 + 0'IO 3 2O'O2 -0-18 I 19-27 -0-93 3 2249 '979 ... — O'l I 3 ... 9'44 — 0-46 2 COMPARISON OF CATALOGUES. Ixxix Comparison between Groombridge and Bradley — continued. K Q 0 R.A. N.P.D. N.P.D. Groombridge i Groombridge. East- Bradley. 3 1 Groombridge. West- Bradley. £ Seconds of Groombridge. East, iSio'o. Groombridge. East- Bradley. M Seconds of Groombridge. West- Bradley. 1 0 s 9 n „ H 5° 2371 2133 O'OO 3 — O'O4 3 35- 67 -0-13 2 34^8 — 0-82 2 2560 231 5 O'OO 3 ... 23'33 — 0-87 2 2650 2355 ... — o'og 3 18-38 -1-62 2 2651 2356 -0-13 3 ... 46-64 -1-26 2 3113 2613 + 0-41 i + 0-39 i .. * .. 3'49 2624 + 0-01 3 4-O-01 3 44-44 -I-86 8 43-94 — 2'O6 6 35°9 2818 ... — o'og i 7-28 -0-32 2 3543 2831 O'OO I +0'OI 2 36-55 — 0-65 i 37-27 40-07 2 5« 121 61 40-1 1 2 — 0-03 2 11*10 4o-20 2 9-38 -I-52 I 462 293 — O'OI 2 ... ... 50-42 -0-18 2 ... 463 294 — 0-02 2 ... ... 589 411 ... — O-O9 3 23-69 — i-ii * 1075 882 -0-14 i ... ... I23O IOOO 18'72 — 0-68 i 1234 1005 ** / * — 0-08 IOIO -0-17 3 ... ^T J 2-13 — 0-67 2 1584 1378 ... ... — 0-05 2 ... ... 1-58 — 2'02 2 1670 H77 ... ... -0-08 3 ... ... 13-39 — 1-31 2 2226 1950 — 0-05 3 ... ... 1-60 — 0-30 3 2290 2027 — O'OI I ... 52-24 — 0-96 2 ... ... 2607 2339 ... 11-34 — 076 5 11-56 -0-54 15 2790 2427 ... ... ... 28-57 —  i 3825 2982* -0-14 3 ... 44-74 — 0-36 2 3844 2990 40-14 2 ... 8-16 -0-54 2 4081 3128 4 O'OI 3 22-28 -1-92 3 ... 52 1303 1063 — 0-06 i 40-13 I 43-42 + 0-52 i 42-15 -0-75 I 3372 2740 -0-24 i ... ... ... * Adopted seconds of Bradley R. A., 1880, 26s'j4. Ixxx INTRODUCTION TO GROOMBRIDGE CATALOGUE. Results of Comparison between Groombridge and Bradley in R.A. and N.P.D., arranged in N.P.D. D. for every Degree. N.P.D. R.A. N.P.D. Groombr. East- Bradley. No. of Stars. 8 Groombr.  — 0-22 I i -'3 — 0-07 I 3 - 7 ... ... -0-42 I 3 - 7 ... ... + 0-32 I 2 - 4 ... + 0-37 2 7 - 3 ... ... + 0-23 2 3 - 0-13 2 5 — i ... •. Ixxxi Results of Comparison between Groombridge and Bradley in R.A. and N.P.D., 1810*0, arranged in N.P.D.for every Degree — continued. R.A. N.P.D. N.P.D. Groombr. No. «• jg Groombr. No. 4 Groombr. No. ,c Groombr. No. <j 45 East- of 1 West- of |5i East- of M West- of • 'B Bradley. Star-. i Bradley. Stars. •£ Bradley. Stars. O •£ Bradley. Stars. O 38 — 0-02 6 20 — 0-03 6 18 57 — 0-04 7 48 39 — 0-01 12 21 — 0-03 9 15 + 0-23 3 46 -0-34 12 4 4° — 0-04 17 21 — 0-02 22 46 — 0-01 9 5° — 0-18 23 97 4i — 0-01 I I 22 — 0-02 4 26 -0-35 4 54 + 0-03 4 53 4* — 0-01 5 25 — 0-02 16 29 + 0-03 13 61 -0-13 4 55 43 + 0-05 10 5 —  — 0-60 ii 18 -0-59 15 55 45 — 0-05 1 1 24 O'OO 7 12 + 0-25 H 62 -0-32 9 S3 46 — O'O2 «4 24 O'OO 17 27 + 0-31 H 59 + °74 16 5° 47 — O'O1 15 23 O'OO 18 36 — 0-09 IS 33 + O'O2 •7 4' 48 — 0-06 ll 37 — 0-07 >3 21 — 0-14 20 42 — 0-07 >3 23 -0-86 16 37 — I'OI 15 36 5° — o-04 24 54 — 0-04 «9 46 -0-68 24 48 — I -06 >9 4° Si — O'O I 1 21 — 0 05 12 28 — 0-69 10 34 -074 5 40 52 -0-15 2 2 +0-13 I I +0-52 No. of Stars. N.P.D. R.A. No. of Stars. N.P.D. No. of Stars. s s o- 5 -0-82 '4 + O'O2 12 30-35 — O'O2 78 — 0-03 1 08 5 -I0 — 0-50 19 + 0-47 16 35-40 — O'OI 61 — O' 12 76 10-15 -0-17 29 O'OO 4« 40-45 + O'O2 IOI -0-18 IOI 15-20 — 0' 10 32 — O'OI 48 45-50 + 0'OI 102 — 0-07 IOI 20- 25 — 0'O2 43 — O'll 60 50-52 O'OO 56 -0-78 55 25-30 — 0-03 54 + 0-05 69 Comparison with Struve' s Catalogue, 1830. There aie 284 stars common to those two catalogues. The Right Ascensions and North Polar Distances given by Struve for 1830 and corrected by the table given on p. 360-371 (Positiones mediae), were reduced to 1810'Q by using the Struve Peters' constants <>f precession and the proper motion given in the body of the Groombridge Catalogue with due regard to the date of observation by Struve. The following table gives the differences Groombridge-Struve for each 5° of N.P.D. in order of N.P.D. l Ixxxii INTRODUCTION TO GROOMBRIDGE CATALOGUE. Comparison with Struve, 1830, for each 5° of N.P.D. in order of N.P.D. 1!.A. N.P.D. R.A. 1 N.P.D. N.P.D. Groombr. No. of Graombr. No. of N.I'.D. Groombr. No. of Groombr. No. of — Struve. Stars. — Struve. Stars. — Struve. Slurs. — Struve. Stars. o 0 & */ o o s // 10-15 - 0-14 17 — o-I 16 3°-35 + °'°3 4' + 0-4 42 15-20 — O'og '3 O'O H 35-40 ; - o-oi 48 + o-5 48 2O-25 — O'O2 2 I + 0'3 21 40-45 + O'O2 35 O'O 36 25-30 4- 0'01 32 + 0'3 32 45-52 4- 0-04 60 + 0-2 61 Comparison ivith the Radcliffe Catalogue, 1845. The following tables are derived from the results given in the section of proper motions under the heading Residuals C — 0. The residuals have been cleared of the systematic corrections, p. xlviii-xlix, applied to the original catalogue places, and therefore represent the systematic corrections to the Radcliffe Catalogue from a direct comparison between Groombridge and the Greenwich modern catalogues referred to the equinox of Newcomb's Catalogue in R.A. and reduced with Pulkowa refractions in N.P.D. The tables are given for every hour of R.A. and for every 5° of N.P.D. The first two tables represent the corrections to R.A. and N.P.D. respectively. The third table gives the corresponding number of stars common to Radcliffe and Groombridge. Deduced Corrections to the Radcliffe Catalogue, 1845. R.A. R.A. 5°-5°. 5°-5°. 5°-5°. 20°-5°. 3°-35°. 35°-4°.  -0-17 — O'lO — 0-08 — 0-09 — 0-03 — O'OI — 0-02 —  — 0-07 4-0-05 I I - 12 -075 -0-18 4-0-14 4-0-18 — 0-04 — 0-16 o-oo -0-08 — o-oi — o-oi 12-13 — 0-07 — 0-64 -0-59 — 0-06 — 0-03 — 0-03 -0-03 4-0-05 — 0-03 -0-03 -0-03 -0-04 -0-03 14-15 -1-51 -0-77 4-0-02 — 0-04 — 0-04 — 0-04 14-15 -1-51 -0-77 4-0-02 — 0-04 15-16 -1-54 - O-05 — 0-05 — 0-05 — 0-05 — 0-05 16- 17 ... -0-33 4-0-04 — o'o6 — 0-02 — 0-07 — 0'02 — 0-04 O'OO — 0-04 4-Q-oi 17- 18 -0-28 — 0-02 4-0-02 — 0-06 4-O-O2 — 0-03 4-0-03 4-0 02 4- o-oi 4-0 05 18- 19 4-0-84 4-0-07 — 0-09 4-0-06 4-0-08 4-0-01 — O'OI 4-0-01 — O'OI 4-O'O2 4-0-05 ig- 20 4-0-41 40-14 — 0-09 4-0-07 4-o-Qi — 0-04 4-Q-oi 4-0-01 4-Q-oi 4-0 05 2O- 21 -°73 + O-2O 4-0-16 4-0-21 4-0-06 4-0-09 4-0-05 4-0-02 4-0-03 o-oo 4-0-04 21 - 22 — 0-84 4-o'o6 4-0-04 -fO'OI O'OO — O'OI 4-0-02 4-0-03 -f 0-02 4-0-05 4-o 05 22 - 23 + 0-57 -|- O- 2 O — 0-05 4-0-05 — O'OI — O'OI 4-0-01 — O'OZ 4-0-02 4-0-06 4-005 23-0 — 0-14 4-0-06 -0-17 4-o'oz -0*3 — O'OI O'OO — O'OI + 0'OI 4-0-02 4-0-05 COMPARISON OF CATALOGUES. Deduced Corrections to the Radcliffe Catalogue 1845. Ixxxiii N.I'.D. o°-S°. S'-io. 10°-I5°. I5°-20°. IO°-25°. *5°-3°°. 3°°-35°. 35°-4°°- 4°°-45°. 45°-50°. So'-si". h. h. „ „ „ H // it „ // // It f o - I + 0-3 + 0-4 — 0-3 - 0-6 -0-8 -0-3 - 0-4 + 0-2 - °'3 + 0'I + 0-4 1 - 2 — O'l O'O — ro — I'O -0-3 + 0-1 -o'S O'O — O'l + 0'2 + «'2 2- 3 — O'2 - 0-9 - °7 — o-i -0-5 O'O — O'l + 07 + 0-5 3- 4 — 0'2 + 0-3 -0-9 -07 -0-3 -0-5 + 0-1 — O'l - 0-3 + o'5 + ri 4- 5 + 0'9 O'O -0-5 - 0-7 — 0'2 + 0-3 o-o + 0-3 - 0-4 + 0'5 + 0-6 5- 6 + O'l - 0-6 -0-5 -0-3 — O-2 •H o-i + 0-4 + 0-1 + 07 + 0-6 6- 7 + 0-8 + 0-1 + 0-3 -0-2 + 0'3 + 0-1 + 0-3 + 0-1 + 07 + o-S 7- 8 + 0-1 + 0-1 -0-6 -0'3 — O'9 o-o — O'l — O'2 + 0-1 + 0-5 + 0-5 8- 9 — ro — o-i — '7 — IM -0'3 — O'l + 0-2 + o'S + 0-1 + 0-5 + 07 9- 10 + 0-5 - °'3 - 0-8 - i '4 O'O + 0-3 + 0-2 — O'2 + O'l + 0-4 10-11 — i-o - 0-9 - 07 -0-6 + 0-2 + 0-2 + 0'I — O'2 + 0-6 + 0-4 11-12 O'O + 0-4 — 0-2 — -i — O'l + o-i + 0-4 O'O - 0'3 + 0-6 + °'4 12-13 + 0-3 -0-9 - -6 — '2 - 0-8 + 0-2 - °'3 + 0-6 + 0-3 + 0-6 + 0-8 13-14 -0-4 — 0-4 — -o ^_ .5 -0-6 - 0-3 — o-i O'O -0-5 + 07 + I'O 14-15 -o-i - >'3 — -o — -o — ri -07 O'O -°'3 -0-5 + 0-2 + 0-8 15-16 + 0-3 — ro — -o — -o — I'O — O'l o-o - °'4 -0-5 + 0-2 + 0-8 16- 17 ... O'O - 7 - -6 - -6 - -0-6 + 0-2 - -0-3 + 0-2 17- 18 - -8 - -6 — P2 — 12 23 I I 46 33 37 4 3 12, I I 20 9 '4 39.4° 18 23 10 3 '9 23 12 5 IO '4 44 35 7 ; 9, 10 '9 17 9 10 3' 17 23 2 7 10 2 7 18 27 28,29 32 16 ... 8 4 1O 1 1 46 '4 25 46 '9 7 8 1 1 16 1 1 25 >3 '4 20 '3 ; 6 9 17 12 6 1 1 10 26 10 i 2 6 4 10 12 21 17 16 6 4 8 6 9 9 '3 13, '4 '3 36 1 1 1 6 5 2 5,6 16 1 1 '5 16 35 5 2 10 2 5 7 18 "4 7 6,5 18 9 4 3 4 9 16 9 '4 13 12 26 H him, o i 2 3 4 6 7 8 9 10 1 1 12 13 Ixxxiv INTRODUCTION TO GROOMBRIDGE CATALOGUE. Number of Stars common to the Radcliffe and Groombridge  4 2 2 12 3 I I IO 8 H 10, 9 21 17 5 I 6 4 10 10 17 16 2O 1 1 16 8 16 i II, 12 14 13 15 7 12 8 '3 8 '7 2 4,5 8 5 8 3 5 19, 20 26 9 18 2 3 6 5 7 16 18 28 42 88 37,38 '9 ... 2 3 4 8 16 28 42 48,47 72 46 20 I 7 4 8 20 24 48 54 61 80 4' 21 2 3 IO, I I 17 •9 30,29 29 61 37 56 '5 22 2 7 16 16 17 31 38 80 41 46 17 23 2 2 8 29 20 27 23 40 40 54 12 In the following tables the correction in order of N.P.D. represents the simple mean of the vertical columns from the tables given above, and the correction in order of R.A. the simple mean of the residuals of the horizontal columns, after taking out the means of the vertical columns, so that the required correction to a star's place is the sum of the two corrections from the two tables. Tables of Systematic Corrections to the Radcliffe Catalogue, 1845, for N.P.D. 20°-52°. In order of R. A. In order of N.P.D. Correction.  7 — O'O4 0-04 O'O !9 + 0-04 O'O !9 + 0-04 O'O 21 + O'O5 10 + O'O5  1869-1892 20, 25, 1870-1881 25, 35, 1869-1880 35, 40, 1870-1884 40, 50, 1869-1891 The results of the present comparison are derived from the section Proper Motions, under the heading Residuals C — 0, and as no systematic corrections were applied to the original catalogue places, they, therefore, represent the systematic corrections to each catalogue of the series, from a direct comparison with Greenwich modern catalogues referred to the equinox of Newcomb's Catalogue in R.A., and reduced with Pulkowa refractions in N.P.D. by the use of the Groombridge proper motions for the average interval of about twelve years. A previous comparison of the first five of these catalogues with the Greenwich Ten Year Catalogue for 1890 was published on p. 47 of the introduction to that catalogue. Correcting the quantities there given, in R.A. to the equinox of Newcomb's Catalogue, and in N.P.D. to Pulkowa refractions, the two sets of comparisons are made comparable. The Land Catalogue has been published since the Greenwich Ten Year Catalogue of 1890 was completed. Part of the differences between the two sets of comparison may be due to the reason that in this new comparison the stars marked as fundamental in the various Astronomische Gesellschaft catalogues have not been used and that some additional Groombridge stars which were not observed in the Ten Year Catalogue for 1890 have been included; the chief cause, however, for the difference between the two results is that all the stars in this new comparison have been reduced from the epoch of observation to 1890 with proper motions, whereas in the previous comparison given in the introduction to the Ten Year Catalogue, 1890. There were only a limited number of stars, mostly those with large proper motions, for which proper motions were determined. The importance of the general result of this discussion on the amount of the systematic errors which may be introduced into star places through unknown proper motions is sufficient excuse for the following details. INTRODUCTION TO GROOMBRIDGE CATALOGUE. In the following tables are given for each hour of Right Ascension the results of these two comparisons, the differences between them called R and R' (columns 4 and 7 respectively), and the number of stars in each comparison. In the case of the Lund Catalogue, the results of the new comparison only are given, as it has been published since the Ten Year Catalogue, 1890, was printed. Now, taking the values of R and R' as given in columns 4 and 7 for each 3h of R.A., and assuming that— A sin a + B cos a + C = E A' sin a + B' cos a + C' = R' the following values are found :— Catalogue. A. B. C. A'. R'. C'. 3 s Kasan. O-23 0-13 0-03 Christiania. — 0-05 — 0-06 Helsingfors. — 0-08 — 0-09 Helsingfors. — 0-08 — 0-03 Harvard. — 0-10 — 0-03 Bonn. — 0-03 Bonn. — 0-03 The co-efficients B, A' and C' represent the principal terms in the effect caused by the solar motion in space, and demonstrate the amount of the error introduced into these star places from this cause for an interval of about twelve years. If we assume that the observations of these five catalogues are... Fully distributed over the periods during which the observations extended, then the following table roughly represents the mean date and the number of years for which solar motion was required. Catalogue. Kasan Christiania. Helsingfors. Harvard Bonn. Mean. Assumed Lean Date. 1880-5 1875-5 1877-0 Intervals. H'5 15-5 13-0 i o-o 1877-5 12-5 A result which is in satisfactory accord with that above can be inferred directly from the following section, where, in an analysis of the proper motion of the stars for solar motion, it is shown that the mean value per century for the Groombridge stars whose proper motion is less than 10° is with the notation usually employed Y = 1"-0 and Z = 1"-0. COMPARISON OF CATALOGUES. Ixxxvii Kasan N.P.D. 10° to 15°. Limits of R.A. R.A. N.P.D. No. of Stars. (0) No. of Stars. (») Greenwich — Ka.san with new P.M. (•) 1890 Cat. — Kasan (») (») (H2) = R. Greenwich —Kasan with new P.M. d) 1890 Cat. 