Dear Michael Koch,
a long time ago I createt on a rainy day in the NW of Germany ( Emden ) a working example for my horizon. It works perfekt without any disturbances.
May be it ist somethig you want. The red signes mark the sunset point at my horizon of the longest and shortest day of the year.
; HORIZON.DAT -- Definition file for objects on the horizon
i N_for_North 0 .5 .5
i N_for_North 43 .5 .4
i E_for_East 47 .5 .4
i E_for_East 90 .5 .5
i S_for_South 133 .5 .4
i E_for_East 137 .5 .4
i S_for_South 180 .5 .5
i S_for_South 223 .5 .4
i W_for_West 227 .5 .4
i W_for_West 270 .5 .5
i N_for_North 313 .5 .4
i W_for_West 317 .5 .4
i null 0 -2 .2
i zwei 21.3 -2 .2
i zwei 23 -2 .2
i fuenf 24.5 -1.4 .2
i vier 44 -2 .2
i fuenf 46 -2 .2
i sechs 66 -2 .2
i sieben 68 -2 .2
i fuenf 69.5 -1.4 .2
i neun 88.7 -2 .2
i null 90.8 -2 .2
i eins 110.5 -2 .2
i eins 111.3 -2 .2
i zwei 112.5 -2 .2
i fuenf 114 -1.4 .2
i eins 133.5 -2 .2
i drei 134 -2 .2
i fuenf 136 -2 .2
i eins 155 -2 .2
i fuenf 156.2 -2 .2
i sieben 157.8 -2 .2
i fuenf 159.3 -1.4 .2
i eins 178.5 -2 .2
i acht 179 -2 .2
i null 181 -2 .2
i zwei 200.3 -2 .2
i null 201.8 -2 .2
i zwei 203.3 -2 .2
i fuenf 204.8 -1.4 .2
i zwei 223.5 -2 .2
i zwei 225 -2 .2
i fuenf 226.5 -2 .2
i zwei 245.3 -2 .2
i vier 246.3 -2 .2
i sieben 248.3 -2 .2
i fuenf 249.8 -1.4 .2
i zwei 268.3 -2 .2
i sieben 269.8 -2 .2
i null 271.3 -2 .2
i zwei 290.3 -2 .2
i neun 291.3 -2 .2
i zwei 293.3 -2 .2
i fuenf 294.8 -1.4 .2
i drei 313 -2 .2
i eins 315 -2 .2
i fuenf 316.5 -2 .2
i drei 335 -2 .2
i drei 336.5 -2 .2
i sieben 338.5 -2 .2
i fuenf 340 -1.4 .2
i eins 0 0 .1
i eins 10 0 .1
i eins 20 0 .1
i eins 30 0 .1
i eins 40 0 .1
i eins 50 0 .1
i eins 60 0 .1
i eins 70 0 .1
i eins 80 0 .1
i eins 90 0 .1
i eins 100 0 .1
i eins 110 0 .1
i eins 120 0 .1
i eins 130 0 .1
i eins 140 0 .1
i eins 150 0 .1
i eins 160 0 .1
i eins 170 0 .1
i eins 180 0 .1
i eins 190 0 .1
i eins 200 0 .1
i eins 210 0 .1
i eins 220 0 .1
i eins 230 0 .1
i eins 240 0 .1
i eins 250 0 .1
i eins 260 0 .1
i eins 270 0 .1
i eins 280 0 .1
i eins 290 0 .1
i eins 300 0 .1
i eins 310 0 .1
i eins 320 0 .1
i eins 330 0 .1
i eins 340 0 .1
i eins 350 0 .1
; Put 'triangle' points at NNO, ONO, etc.
f 3 10 32 32
22 0
22.5 2
23 0
f 3 10 32 32
67 0
67.5 2
68 0
f 3 10 32 32
112 0
112.5 2
113 0
f 3 10 32 32
157 0
157.5 2
158 0
f 3 10 32 32
202 0
202.5 2
203 0
f 3 10 32 32
247 0
247.5 2
248 0
f 3 10 32 32
292 0
292.5 2
293 0
f 3 10 32 32
337 0
337.5 2
338 0
i sun 46.655 -0.7 .2
i sun 130.375 -0.7 .2
i sun 229.607 -0.7 .2
i sun 313.334 -0.7 .2
end
If you are satisfied I am gratified.
Best regards
Ulrich