Questa tabella permette la suddivisione dell’eclittica disegnata su un astrolabio planisferico nei 12 settori dello zodiaco. Per ogni grado di longitudine eclittica $\lambda$ la tabella fornisce il valore di ascensione retta $\alpha$ corrispondente. E’ stata utilizzata la seguente formula (vedi Coordinate equatoriali dei punti dell’eclittica):

$$\tan\alpha = \frac{\sin\lambda\cos\epsilon}{\cos\lambda}$$

dove $\epsilon$ è l’obliquità dell’eclittica. Il valore di $\epsilon$ è quello attuale: $\text{23,4}^\circ$.

I nomi delle case dello zodiaco sono posti in corrispodenza del loro primo punto di longitudine.

Casa zodiacale
Longitudine $\lambda$
Ascensione retta $\alpha$
Ariete
0
0
1
0.9
2
1.8
3
2.8
4
3.7
5
4.6
6
5.5
7
6.4
8
7.3
9
8.3
10
9.2
11
10.1
12
11
13
12
14
12.9
15
13.8
16
14.7
17
15.7
18
16.6
19
17.5
20
18.5
21
19.4
22
20.3
23
21.3
24
22.2
25
23.2
26
24.1
27
25.1
28
26
29
27
Toro
30
27.9
31
28.9
32
29.8
33
30.8
34
31.8
35
32.7
36
33.7
37
34.7
38
35.6
39
36.6
40
37.6
41
38.6
42
39.6
43
40.6
44
41.5
45
42.5
46
43.5
47
44.5
48
45.5
49
46.6
50
47.6
51
48.6
52
49.6
53
50.6
54
51.6
55
52.7
56
53.7
57
54.7
58
55.8
59
56.8
Gemelli
60
57.8
61
58.9
62
59.9
63
61
64
62
65
63.1
66
64.1
67
65.2
68
66.2
69
67.3
70
68.4
71
69.4
72
70.5
73
71.6
74
72.6
75
73.7
76
74.8
77
75.9
78
77
79
78
80
79.1
81
80.2
82
81.3
83
82.4
84
83.5
85
84.6
86
85.6
87
86.7
88
87.8
89
88.9
Cancro
90
90
91
91.1
92
92.2
93
93.3
94
94.4
95
95.4
96
96.5
97
97.6
98
98.7
99
99.8
100
100.9
101
102
102
103
103
104.1
104
105.2
105
106.3
106
107.4
107
108.4
108
109.5
109
110.6
110
111.6
111
112.7
112
113.8
113
114.8
114
115.9
115
116.9
116
118
117
119
118
120.1
119
121.1
Leone
120
122.2
121
123.2
122
124.2
123
125.3
124
126.3
125
127.3
126
128.4
127
129.4
128
130.4
129
131.4
130
132.4
131
133.4
132
134.5
133
135.5
134
136.5
135
137.5
136
138.5
137
139.4
138
140.4
139
141.4
140
142.4
141
143.4
142
144.4
143
145.3
144
146.3
145
147.3
146
148.2
147
149.2
148
150.2
149
151.1
Vergine
150
152.1
151
153
152
154
153
154.9
154
155.9
155
156.8
156
157.8
157
158.7
158
159.7
159
160.6
160
161.5
161
162.5
162
163.4
163
164.3
164
165.3
165
166.2
166
167.1
167
168
168
169
169
169.9
170
170.8
171
171.7
172
172.7
173
173.6
174
174.5
175
175.4
176
176.3
177
177.2
178
178.2
179
179.1
Bilancia
180
180
181
180.9
182
181.8
183
182.8
184
183.7
185
184.6
186
185.5
187
186.4
188
187.3
189
188.3
190
189.2
191
190.1
192
191
193
192
194
192.9
195
193.8
196
194.7
197
195.7
198
196.6
199
197.5
200
198.5
201
199.4
202
200.3
203
201.3
204
202.2
205
203.2
206
204.1
207
205.1
208
206
209
207
Scorpione
210
207.9
211
208.9
212
209.8
213
210.8
214
211.8
215
212.7
216
213.7
217
214.7
218
215.6
219
216.6
220
217.6
221
218.6
222
219.6
223
220.6
224
221.5
225
222.5
226
223.5
227
224.5
228
225.5
229
226.6
230
227.6
231
228.6
232
229.6
233
230.6
234
231.6
235
232.7
236
233.7
237
234.7
238
235.8
239
236.8
Sagittario
240
237.8
241
238.9
242
239.9
243
241
244
242
245
243.1
246
244.1
247
245.2
248
246.2
249
247.3
250
248.4
251
249.4
252
250.5
253
251.6
254
252.6
255
253.7
256
254.8
257
255.9
258
257
259
258
260
259.1
261
260.2
262
261.3
263
262.4
264
263.5
265
264.6
266
265.6
267
266.7
268
267.8
269
268.9
Capricorno
270
270
271
271.1
272
272.2
273
273.3
274
274.4
275
275.4
276
276.5
277
277.6
278
278.7
279
279.8
280
280.9
281
282
282
283
283
284.1
284
285.2
285
286.3
286
287.4
287
288.4
288
289.5
289
290.6
290
291.6
291
292.7
292
293.8
293
294.8
294
295.9
295
296.9
296
298
297
299
298
300.1
299
301.1
Aquario
300
302.2
301
303.2
302
304.2
303
305.3
304
306.3
305
307.3
306
308.4
307
309.4
308
310.4
309
311.4
310
312.4
311
313.4
312
314.5
313
315.5
314
316.5
315
317.5
316
318.5
317
319.4
318
320.4
319
321.4
320
322.4
321
323.4
322
324.4
323
325.3
324
326.3
325
327.3
326
328.2
327
329.2
328
330.2
329
331.1
Pesci
330
332.1
331
333
332
334
333
334.9
334
335.9
335
336.8
336
337.8
337
338.7
338
339.7
339
340.6
340
341.5
341
342.5
342
343.4
343
344.3
344
345.3
345
346.2
346
347.1
347
348
348
349
349
349.9
350
350.8
351
351.7
352
352.7
353
353.6
354
354.5
355
355.4
356
356.3
357
357.2
358
358.2
359
359.1