Starfinder Live Problems Solving for USCG Exams
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- Опубликовано: 3 окт 2024
- In this live session we will use the Starfinder, 2102-D to solve USCG exam problems such as star identification and star selection.
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On 17 March your 1845 DR position is latitude 25° 10.0’ N, longitude 66° 48.0’ W. You observe
an unidentified star bearing 320° T at an observed altitude (ho) of 50° 02.9’. The chronometer
reads 10h 47m 49s and is 1m 54s fast. What star did you observe?
A: Mirfak
On 28 February, your 1850 zone time DR position is latitude 27° 49.0’ N, longitude 159° 24.0’
W. Considering their magnitude, azimuth, and altitude, which group includes the three stars best
suited for a fix at star time?
a) Rigel, Schedar, Regulus- correct
b) Sirius, Mirfak, Elnath
c) Hamal, Alkaid, Canopus
d) Bellatrix, Vega, Regulus
Missed the live stream but just watched. Very well done. Much appreciated
Cheers from india 🇮🇳
10:47 pm was clock time. Military time 22:47
Then the answer works
First of all, if you can see a star, any star, at 10hrs 47min 49secs, you have far superior eyesight than me in the middle of the morning. Even at 10 am minus the four hours means you can see stars at 0646 local and secondly, west of Greenwich, each 15° will be GMT minus on hour not plus one hour?
I admitted to the math error in the video....
It's a typo, it should end up being 2245 GMT, and therefore 1845 zone time. Watch time plus four hours gets you GMT. ZD (+4) in USCG language. Four hours west of Greenwich as you describe. Chronometers are in 12 hour time and not 24 hour time. That was the error.
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LHA = GHA + East Longitude
LHA = GHA - West Longitude