NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Herman Dekker
Date: 2023 Aug 5, 08:18 -0700
I want only to identify the bright Star.
Ho= 73°30' , Zn A bit North of East. mmm I take a guess Zn=80°
Position North Carolina. mmm from one paper atlas chart guess 35°N 79°W
UT=01:55
I wanted NOT to use any app or online source to solve the problem.
Only the Modern Celestial Navigation approach with Almanac or one analog device
or handheld Calculator.
1. I attemped Tibor Meseta's Starfinder, but the one I own is made for my latitude 52°N
Try to use it anyway. With the supplied values I found.
Around East there are only 3 navigational stars
Deneb Magn 1.2, Vega Magn 0.0 and Eltanin Magn 2.2
So from Magitude value it will be Vega.
A starfinder for Latitude 35°N should give better info, but I have it not.
I also noted from the Starfinder the LHAaries=256°
2. I attemped the HO249 Vol1 with the supplied Values and LHAaries but that lead to nothing.
The values need to be more accurate for this use. Vega was not noted on 35°N page
around LHAaries 256°
3. With the handheld Calculator I used the formula
Dec=arcsin(sin Lat•sin Ho + cos Lat•cos Ho•cos Zn) =36,2°
On the Navigational Star Chart I searched on the 36° Declination line for a bright Star
Vega was the nearest.
I should have helped as I could calculate the SHA from the values, that could me lead
nearer to Vega.
But I could not find that formula for the calculator. Somebody knows that formula?
4. I used the Star ID menu from the TI-89 Starpilot calculator.
I narrowed the searchfield by changing the Ho bandwith and the Magnitude.
The first page gave the Values GHA=58°43', SHA=82°30', Dec 36°11'.
The second page identified the star as Vega.
Back to the Navigational Star Chart with the SHA 82°30' and Dec 36°11'
Definitively pointed to Vega.
So remaining question. The SHA formula for the Handheld Calculation.
Regards,
HermanD