NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lunar longitudes, not by lunar distance.
From: Hanno Ix
Date: 2009 Aug 9, 11:40 -0700
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From: Hanno Ix
Date: 2009 Aug 9, 11:40 -0700
Gentlemen: I certainly will study your suggestions in all detail. I thank you again for the mental energy and time you have invested. The instruments you show in the responses are fascinating and incredibly ingenious. I envy you. I hope to hear more from you about them and their use. I think you all agree the concept is sound, and a trial, particularly with a theodolith, would be worthwhile. Now, I have to confide in you that I promised the Vienna Observatory to make an attempt to recreate their Chronodike in return for their digging up info about it. They don't know if one still exists. Which makes me honor bound to do build one! I do have the tools - about my skills I will find out. So, with your permission, I will forgo the purchase of a theodolith and spend my money and time on building a Chronodike. I will report in time. Please be patient - I am also in a construction project. At this point, may I expand, though, on our discussion? Assume, you have on board an almanach, a stopwatch - and a well stuffed woodworker's tool chest. You are skilled in woodworking. You arrive at our lonely island which has lots of trees and great views of the skies. ( Food and water, too! ) You don't know where you are, nor do you know GMT. Now, you start wondering if you could apply our concept by using a camara obscura - the camera with nothing but a hole in one side. My questions: 1. Is it astronomically a sound idea? Is it optically realistic? 2. If the answer is yes, and given an the best, but realistic, camera obscura you can think of how would you plan your observations and sight reduction? 2. How would you build your camera obscura, what featuers would it have? Are there any improvements that you could apply to the known camera obscura to accomplish your goal? These improvements should be commensurable to your tools. 3. Can you think of any other set-up you could build on the island that works equally good even better than your camera obscura? Actually, I personally do like the idea of spending time on a nice tropical island pursueing an avocation of mine. Actually, San Diego is not bad either. Best regards H --- On Sun, 8/9/09, Nicolàs de Hilster <groups@dehilster.info> wrote:
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