Please note that in practice your “intercept” i.e. the difference between actual
elevation and calculated elevation, should be very small, in any event, less than 30
miles or 30 minutes of arc. You will notice that when doing sightings and lines of
position with data different than that used in this tutorial, you may find much larger
differences. The reason is that I’m not 100% sure of all the parameters of VS’ “celestial
mechanics” and there might be slight differences that I may have not taken into
This sextant is provided for the purpose of virtual celestial navigation, it was tested and found to have acceptable level of error like the one found in real observations.
...it was tested and found to have acceptable level of error like the one found in real observations.
your opinion is important !
laukejas wrote:While experimenting further, I noticed that sometimes, I cannot get a stars fix even with that 41:18 GMT adjustment you suggested.
Time: 02:27:25 (on sextant GMT, uncorrected)
Sighting Sirius. Elevation 27:29:06
Subtracting 41:18 from GMT (GMT becomes 1:46:07), I get my LOP off by 6.4nm
But if I subtract 40:18 (GMT becomes 1:47:07), LOP is off by 0.3nm, which is an almost perfect sight.
Any comment on that, Ron? Can you confirm my results in that scenario?
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