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Thanks John, will give them a try. If I explain what I am doing there may be another solution. I am fitting beaching legs to my yacht and there will be 2 x M24 stainless steel long nuts fitted into the hull. The beaching legs will bolt into these long nuts with M24 bolts when in use just 2 or 3...

I am looking for 2 of the above. I understand the correct term for the screw I am looking for is "socket setscrew". It is a short length of m24 threaded rod with a allen key drive. I thought I found some on the internet a couple of days ago but unable to find again. Can anyone help. Thanks Mike

Hi motorbiking, When you say there is an absence of anything visible to get a fix from I am intrigued to know how this is done?. Mike

Thanks again, Unfortunately do not have sufficient knowledge of maths to understand the above, this is why I need to ask for help on here. However I started this thread doubting that the very simple method described in a book I am studying for creating your own plotting sheet might not produce...

I am aware I am the only person with the slightest interest in this subject but I have just drawn my line at 60 degrees and AB does indeed measure 2x the distance between the origin of the 2 vertical lines. Evidence that the instructions in the book are correct. Mike

Thanks EFLImpudence, Found one. It may be that the instructions in the book are correct. One minute of latitude is one nautical mile irrespective of latitude. However one minute of longitude is 1 nautical mile at the equator but zero distance at the poles. One might expect at 45 degrees latitude...

I did not realise that was a video and have just watched it myself. Cannot believe how someone could make such an error in what must be his area of expertees. Whichever way you look at it, it is incorrect. A nautical mile is 1,852 metres. Not sure about Plotting an LOP either. Should it be...

Condensation forms when air which has invisible moisture within it caused by evaporation cools, the warmer the air the more moisture can be contained within it. Many examples..........When you open the upright freezer door a slight mist appears, this is the meeting of the warm moist air within...

No doubt in my mind its condensation. Insulation is the solution, I am sure it will make an enormous difference. I also live in an old stone house with 24 inch walls and did insulate upstairs when I moved in and the walls are just as they would be in a modern house. Seriously regret not doing...

Thought this might help................ A great circle drawn around the Earth passing through both poles is 21,600 miles (nautical) and is also 360 degrees. The Equator is also a great circle, it is 21,600 miles and is also 360 degrees As we move our latitude N or S away from the equator and...

Hi motorbiking, You are correct commercial plotting sheets do come with a scale but here I am trying to create my own plotting sheet and try to ensure my scale is correct Mike

Hi EFLImpudence, Thanks for your reply. The point here is I think the instructions how to make your own plotting sheet are incorrect in the book I am studying and am seeking confirmation of this and perhaps an alternate solution. I can see from your drawing you have misunderstood my...

Cannot help thinking after the excellent response to yesterdays question there is an issue with this question? You maybe need something stronger than coffee. Mike

Fascinating. When I first noticed the word "converging" in this thread I was a little confused. I have always understood light from stars was diverging and have never before read any reference to it converging. For all practical purposes I will still consider that light diverges from stars but...

Will do my best to explain the problem.......... In Celestial navigation there comes a time when a plotting sheet is required. Briefly a plotting sheet is a piece of paper with a latitude scale up the side and a longitude scale along the bottom. The thing is the scale needs to be correct for...

Thanks EFLimpudence, Of course you are correct. I have found my calculations from 2 years ago, working in miles then. Sirius 50,620,843,088,484 miles (whether this is correct or not it is the figure I used. I managed to determine 1 minute of arc was 14,730,933,173.9 miles (hope this is...

Thanks SFK, Its not difficult to see why light rays from stars can be considered to be parallel when we reduce the problem to a scale we are able to comprehend. Mike

Now attempting to solve other question. What size would Sirius be if everything scaled down so Sirius Earth distance was 970 km (Lands End to John o Groats as crow flies) New Sirius distance 81,468,671,000,000 divided by 970 = 83,988,320,618.6 Sirius distance is 83,988,320,618.6 times the...

272,819 km ? Mike

Using the new corrected Sirius distance 8.611 lt yrs I will attempt the golf ball calculation. A lt yr is 9.461e+12 km - very unsure about this However I guess this means 9,461,000,000,000 km x 8.611 lt yrs = 81,468,671,000,000 km (distance to Sirius) divide by Earth diameter 12,742 km =...