As you go south you lose them in this order. Match your latitude against DecMn to find the most northerly still visible.
Code:
M DecMx DecMn
82 90.0000 -20.3167
81 90.0000 -20.9333
52 90.0000 -28.4167
103 90.0000 -29.3000
40 90.0000 -31.9167
102 90.0000 -34.2333
108 90.0000 -34.3333
97 90.0000 -34.9833
101 90.0000 -35.6500
109 90.0000 -36.6167
109b 90.0000 -37.6667
76 90.0000 -38.4333
39 90.0000 -41.5667
106 90.0000 -42.7000
51b 90.0000 -42.7333
51 90.0000 -42.8000
92 90.0000 -46.8667
34 90.0000 -47.2167
63 90.0000 -47.9667
110 90.0000 -48.3167
31 90.0000 -48.7333
94 90.0000 -48.8833
32 90.0000 -49.1333
29 90.0000 -51.4667
13 90.0000 -53.5333
38 90.0000 -54.1667
36 90.0000 -55.8667
57 90.0000 -56.9667
37 90.0000 -57.4500
33 90.0000 -59.3500
56 90.0000 -59.8167
3 90.0000 -61.6167
35 90.0000 -65.6667
45 90.0000 -65.8833
27 90.0000 -67.2833
1 90.0000 -67.9833
64 90.0000 -68.3167
44 90.0000 -70.0167
71 90.0000 -71.2167
85 90.0000 -71.8167
53 90.0000 -71.8333
100 90.0000 -74.1833
74 90.0000 -74.2167
98 90.0000 -75.1000
91 90.0000 -75.5000
99 90.0000 -75.5833
88 90.0000 -75.5833
90 90.0000 -76.8333
65 90.0000 -76.9167
66 90.0000 -77.0167
86 90.0000 -77.0500
84 90.0000 -77.1167
105 90.0000 -77.4167
89 90.0000 -77.4500
87 90.0000 -77.6000
15 90.0000 -77.8333
96 90.0000 -78.1833
58 90.0000 -78.1833
67 90.0000 -78.2000
95 90.0000 -78.3000
59 90.0000 -78.3500
60 90.0000 -78.4500
49 90.0000 -82.0000
61 90.0000 -85.5333
5 90.0000 -87.9167
78 90.0000 -89.9500
77 89.9833 -90.0000
2 89.1833 -90.0000
12 88.0500 -90.0000
14 86.7500 -90.0000
10 85.9000 -90.0000
43 84.7333 -90.0000
42 84.5500 -90.0000
48 84.2000 -90.0000
11 83.7333 -90.0000
50 81.6667 -90.0000
26 80.6000 -90.0000
104 78.3833 -90.0000
72 77.4667 -90.0000
73 77.3667 -90.0000
107 76.9500 -90.0000
16 76.2167 -90.0000
47 75.5000 -90.0000
46 75.1833 -90.0000
17 73.8167 -90.0000
18 72.8667 -90.0000
24 71.5167 -90.0000
9 71.4833 -90.0000
23 70.9833 -90.0000
25 70.7500 -90.0000
41 69.2667 -90.0000
75 68.0833 -90.0000
21 67.5000 -90.0000
80 67.0167 -90.0000
20 66.9667 -90.0000
30 66.8167 -90.0000
93 66.1333 -90.0000
22 66.1000 -90.0000
8 65.6167 -90.0000
79 65.4500 -90.0000
28 65.1333 -90.0000
19 63.7333 -90.0000
4 63.4667 -90.0000
68 63.2500 -90.0000
83 60.1333 -90.0000
62 59.8833 -90.0000
54 59.5167 -90.0000
55 59.0333 -90.0000
6 57.7833 -90.0000
70 57.7000 -90.0000
69 57.6500 -90.0000
7 55.1833 -90.0000