| Main observatories | Telescope | Longitude | Latitude | elevation |
| diameter | ||||
| in cm | 
' '' |
' '' |
meters | |
ASHEVILLE (USA) |
T20 | 82  25 45 W |
35 36 00 N |
670 |
| ALMA-ATA (Kazakhstan) | T60 | 77 52 45 E |
43 13 20 N |
2750 |
| BARCELONA (Spain) | T16 | 02 12 07 E |
41 25 18 N |
40 |
| BORDEAUX (France) | T62 | 00 32 00 W |
44 50 00 N |
73 |
| BOSKOOP (The Netherlands) | T30 | 04 41 35 E |
52 04 35 N |
0 |
| BOWIE (USA) | T20 | 76 48 00 W |
39 00 00 N |
50 |
| BUCAREST (Romania) | L38 | 26 05 46 E |
44 24 50 N |
86 |
| CACERES (Spain) | T25 | 06 23 00 W |
39 27 00 N |
440 |
| CALERN, OCA/CERGA (France) | T150 | 06 55 18 E |
43 45 17 N |
1282 |
| CATANIA1 (Italy) | T91 | 14 58 45 E |
37 41 30 N |
1725 |
| CATANIA2 (Italy) | T20 | 15 03 20 E |
37 39 43 N |
300 |
| CATANIA3 (Italy) | T20 | 14 57 40 E |
37 39 43 N |
1250 |
| CHATEAUGIRON (France) | T21 | 01 30 01 O |
48 02 41 N |
70 |
| COMTHUREY (Germany) | L18 | 13 11 31 E |
53 16 04 N |
150 |
| ELLINBANK (Australia) | T32 | 145 57 30 E |
38 14 47 S |
138 |
| ESO, La Silla (Chile) | T220 | 70 43 45 W |
29 15 26 S |
2200 |
| ESSEN (Germany) | T36 | 07 04 15 E |
41 24 35 N |
40 |
| FUNAHO (Japan) | T28 | 33 42 43 E |
34 34 43 N |
8 |
| KAVALUR (India) | T235 | 78 49 49 E |
12 34 49 N |
725 |
| LISBOA (Portugal) | T20 | 09 07 42 W |
38 43 30 N |
96 |
| LUMEZZANE (Italy) | T40 | 09 08 22 E |
45 28 11 N |
122 |
| MADRID (Spain) | -- | 03 49 09 W |
40 17 49 N |
680 |
| MEUDON (France) | T100 | 02 14 00 E |
48 48 00 N |
162 |
| MILAN (Italy) | L08 | 09 07 22 E |
45 27 19 N |
138 |
| MUNCHEN (Germany | T28 | 11 34 30 E |
48 11 17 N |
520 |
| NAUCHNY (Crimea) | T60 | 34 01 00 E |
44 43 37 N |
600 |
| NEW-YORK (USA) | T20 | 78 00 00 W |
43 00 00 N |
200 |
| OHP, Haute-Provence Obs. (France) | T80 | 05 43 00 E |
43 56 00 N |
665 |
| OKAYAMA (Japan) | T35 | 33 52 36 E |
34 36 25 N |
3 |
| OOSTDUINKERKE (Belgium) | T25 | 02 40 45 E |
51 06 48 N |
4 |
| PIC-DU-MIDI, OMP (France) | T105 | 00 09 00 E |
42 56 00 N |
2861 |
| PARIS (France) | L38 | 02 20 00 E |
48 50 00 N |
67 |
| PRAHA (Czech Republic) | L15 | 14 28 41 E |
50 08 30 N |
325 |
| RAGUSA (Italy) | T20 | 14 39 43 E |
36 46 15 N |
25 |
| REUX (Belgium) | T30 | 05 05 27 E |
50 14 43 N |
317 |
| SAN FERNANDO (Spain) | T33 | 06 12 21 W |
36 27 40 N |
30 |
| SASSOEIROS (Portugal) | T25 | 09 19 34 W |
38 42 01 N |
64 |
| SEVILLA (Spain) | T21 | 05 58 47 W |
37 23 40 N |
50 |
| TENERIFE (Canarian Islands) | T20 | 16 30 38 W |
28 17 45 N |
2374 |
| STUTTGART (Germany) | T30 | 09 08 15 E |
48 42 00 N |
441 |
| TOPEKA (USA) | L38 | 95 44 58 W |
39 00 03 N |
313 |
| TORINO (Italy) | T15 | 07 38 10 E |
45 02 51 N |
622 |
| UCCLE (Belgium) | T85 | 04 21 29 E |
50 47 55 N |
105 |
| WILP-ACHTERHOEKE (The Netherlands) | T20 | 06 03 52 E |
52 12 29 N |
6 |
| ZARAGOZA (Spain) | T15 | 00 52 30 W |
41 38 46 N |
247 |