LONG BY CHRON - CELESTIAL NAVIGATION | Taking sight to obtain a Position line ( Observed longitude )
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- เผยแพร่เมื่อ 7 ก.พ. 2025
- #sailorvikas #longbychron #celestialnavigation #celnav
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My videos are prepared based on extensive research and all are made to make learning easy and simplified.
Do Watch, Like, share and
MOST IMPORTANT "Comment" below if you like ...It will give me Motivation to prepare more, putting extra efforts and explaining in the MOST SIMPLIFIED WAY so that you guys can excel in your examination.
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LAT BY MERIDIAN ALTITUDE -
th-cam.com/video/9X1fiZMpC2E/w-d-xo.html
SEXTANT ALTITUDE CORRECTION -
th-cam.com/video/1WqirNAn8W4/w-d-xo.html
Sir , why in sight calculation we preferred long by chron in morning time
Sir you are a genius...thank you for taking so much efforts to make these videos...it becomes easy and the understanding becomes very clear on knowing the details like wht do we subtract 360 - p...thanks a lot..
Great you liked it, ❤️
U are doing very informative tqu sir I am getting boreing in classes because they will theoretical manner but u are amazing doing magical with animation not only many videos in urs channel I viewed more videos please continue don't stop. If u are doing means future generations will get easy to understand love so much and we will respect yours work love from india ♥️♥️♥️♥️🙏🙏🙏🙏🇮🇳🇮🇳🇮🇳🇮🇳🇮🇳
Thanks a lot ❤️ do share pls
Awesome explanation thanks sir ❤
Welcome bro
Awesome explanation thanks sir
Thankyou....well do share this channel with your friends too !
Very convenient..
Great🔥
1. When you use formula n calculator, why do you calculate TZD, When not being used???
2. Tell me, in Long x Chron why do you calculate the Azimuth n PL.???
3. Pls tell me how do you arrive at Noon Posn after applying the run, and how do you apply the run.???
1.TZD is used in sight calulations like intercept and meridian passage.
2. In long by chron, azimuth is calculated to obtain compass error and to obtain vessels posn , you need atleast 2 PL , so 1 PL is obtained by long by chron sight and 2nd PL is obtained by merpass calculation....so when u apply run on initial posn , let's say vsl speed is 15kts so for 3 hrs it travelled 45 miles so in a graph u draw 45miles from initial position with whatever course you are steering and after obtaining posn u will apply 1st PL onto the merpass PL to obtain vsls position.
3. Your third question is answered in 2nd point.
Thank you sir
Thank you so much sir very helpful please make more videos
Thanks, do share with your sailor frnds !
Well understood sir !!
👍
Why in morning time in sight calculation we prefer long of chron method in morning ???
U said long by chron should not be used near OBS meridian as rate of change in alt is fast, then which we are going to use?? What I have read in book, in order to calculate noon sight second officer uses long by chron as it does not contains tzd czd calculation.. please clarify my doubt as my thinking and Ur explanation is 180* apart
I said long by chron not to b used before sun is near to observer meridian......because change in altitude is very fast that time......2nd officer uses long by chron of the morning sight....which is taken probably 8am in morning .....if long by chron is taken at 1150 for eg. ....which is more near to mer pass time than erroneous posn will b obtained. I hope u got it,my explanation is not 180 degree apart ! Don't judge ☺️
I am not judging, just wanted to clear my doubt as exams are near.. hope you are taking all those in a +ve way
Sir how we can use this method to get position fix
We get posn (fix) by intersection of 2 or more PLs thus u take one more sight, than you get 2nd PL, Now you apply run on initial DR lat and transfer ur 1st PL onto the 2nd PL and than you get the position ( fix )
Bhai make a vedio how calculate error in every watch ..Bhai by book to bahut lamba hojata hai nikalna koi dosara method batay
How 49 degrees
LAT BY MERIDIAN ALTITUDE -
th-cam.com/video/9X1fiZMpC2E/w-d-xo.html
what mean PL?
Position line
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