NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Antoine Couëtte
Date: 2010 Mar 31, 09:13 -0700
Dear George and Brad,
Please find hereunder the positions derived from 3 of the 4 Lunars taken in Ohama Reno Harbour. As for ALL previous results which I have published here I keep assuming that all 1773 published Heights were corrected for ONLY instrument errors. For the time being this still remains a most reasonable assumption.
*******
07 Sep 1773 , delta T = + 16.4 s
IF WE ASSUME HEIGHT OF EYE IS 0 FT, then get the following :
Lunar Distance Observation Time UT = 17h05m47s3, and
Observed position : S 16°22°02" / E 208°10'51", and
IF WE ASSUME HEIGHT OF EYE is 12 FT, then get the following results :
Lunar Distance Observation Time UT = 17h05m37s6, and
Observed position : S 16°29'19" / E 208°11'01"", and
IF WE ASSUME HEIGHT OF EYE is 24 FT, then get the following results :
Lunar Distance Observation Time UT = 17h05m33s6, and
Observed position : S 16°32'19" / E 208°11'05"
*******
09 Sep 1773 , delta T = + 16.4 s
IF WE ASSUME HEIGHT OF EYE IS 0 FT, then get the following :
Lunar Distance Observation Time UT = 18h05m38s0, and
Observed position : S 16°21'22" / E 208°38'53", and
IF WE ASSUME HEIGHT OF EYE is 12 FT, then get the following results :
Lunar Distance Observation Time UT = 18h05m32s7, and
Observed position : S 16°27'04" / E 208°38'17", and
IF WE ASSUME HEIGHT OF EYE is 24 FT, then get the following results :
Lunar Distance Observation Time UT = 18h05m30s3, and
Observed position : S 16°29'26" / E 208°38'10"
*******
11 Sep 1773, , delta T = + 16.4 s, with results here-below already published in [NavList 12623] earlier to-day.
IF WE ASSUME HEIGHT OF EYE IS 0 FT, then get the following :
Lunar Distance Observation Time UT = 19h01m07s0, and
Observed position : S 16°31'37" / E 208°23'51", and
IF WE ASSUME HEIGHT OF EYE is 12 FT, then get the following results :
Lunar Distance Observation Time UT = 19h01m03s3, and
Observed position : S 16°36'09" / E 208°22'48", and
IF WE ASSUME HEIGHT OF EYE is 24 FT, then get the following results :
Lunar Distance Observation Time UT = 19h01m01s8, and
Observed position : S 16°38'02" / E 208°22'21"
*******
Comments :
1 - Why no position computed for Sep 08 th ?
Simply because there is no Sun height published for that date. I could easily compute one, and fully process the rest of the data, but I prefer not since I would "play on data" which I do not wish to.
2 - Interesting set of observations in which the derived Longitudes are almost insensitive to the various HoE's. So average observed Longitudes are close from E 208°24' . What does Google Earth say here ?
3 - Again, on these 3 observations, the Latitudes closest from the published one (16°45'30") are obtained for HoE's equal to 24' . Should we tweak this 23 ft value up ? What do you think, George ?
4 - The mysterious "Printer dagger signs" do not seem in any way related to HoE, at least in these examples. :-) !!!
Best Regards, and thank you for your comments,
Antoine M. "Kermit" Couëtte
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