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Search took 0.00 seconds. Search: Posts Made By: StuM
Forum: Navigation 06-01-2017, 14:57
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

Just to add,

Mike - I hope you have also learnt a little about spurious precision, error ranges and how much to trust quoted numbers.

It's useful knowledge which helps in interpreting the...
Forum: Navigation 06-01-2017, 00:07
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

Don't know where your figure of 8 billion comes from. We all agree that it is about 15 billion miles.

Any more precision than that is fairly meaningless since no one knows exactly how far away...
Forum: Navigation 03-01-2017, 16:50
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

And 3.1415926535897932384626433832795028841971693993751058209749445923078164062862 is an even better approximation :)

But neither of them can improve the accuracy beyond the precision of the...
Forum: Navigation 03-01-2017, 14:57
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

What you've done wrong is assumed that precision and accuracy are the same thing.

You have the number of miles in a light year to 14 digits, but then use " x 8.611" ( 4 digits) as an...
Forum: Navigation 02-01-2017, 17:07
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

Go on, rub it in! :biggrin:
Forum: Navigation 02-01-2017, 16:23
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

Possibly an approximation of pi used in converting degrees to radians (which would also explain the factor of 2) ?

Which sort of makes the precision of his 5878625373183.6 miles/light year a bit...
Forum: Navigation 02-01-2017, 14:48
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

Kelkara is correct, :thumb:

I used diameter instead of radius of Earth's orbit above :redface:.

I've corrected my figures.
Forum: Navigation 02-01-2017, 14:30
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

Hmmm, one of us it out by a factor of two or three. I'll check. :)
Forum: Navigation 02-01-2017, 14:27
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

OK, Sirius is 8.6 light years away which is 2.64 parsecs. (see earlier post about parsecs)

So you would need to go 2.64 x mean earth orbit to subtend 1 second.

So you would need to go 2.64 x...
Forum: Navigation 02-01-2017, 00:08
Replies: 41
Views: 5,044
Posted By StuM
Re: Celestial Nav?

Just to put it into perspective, a Parsec (parallax second) is the distance subtended by one SECOND of arc across the Earth's mean ORBIT.

That is 3.26 light years, or considerably less than the...
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