pabrides,
All of your final figures are correct.
As we all know, mostly by experience, an accuracy close to 4 or 5 nm is excellent....while at sea.
Here's an idea to try- remove your sextant's telescope and make an observation without it. Then do the reduction and see if there has been any change.
Another idea is to bring the Sun down in the AH so that it overlaps the reflected Sun. You'd only need corrections for parallax and refraction and not Semi-Diameter.
Concerning time- your chronometer would have to be off consistently 20 seconds to get the error you're finding.
GPS can truly and really be in error too.
I can't think of anything else, at the moment.
Merry Christmas and a Happy New Year!
Ed
All of your final figures are correct.
As we all know, mostly by experience, an accuracy close to 4 or 5 nm is excellent....while at sea.
Here's an idea to try- remove your sextant's telescope and make an observation without it. Then do the reduction and see if there has been any change.
Another idea is to bring the Sun down in the AH so that it overlaps the reflected Sun. You'd only need corrections for parallax and refraction and not Semi-Diameter.
Concerning time- your chronometer would have to be off consistently 20 seconds to get the error you're finding.
GPS can truly and really be in error too.
I can't think of anything else, at the moment.
Merry Christmas and a Happy New Year!
Ed