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Thread: Help With an Exam Question
Post: RE: Help With an Exam Question
| Oh how I love the possible answers!
C.....hilarious!!!
Carlos (my parents are both from Holland and they liked the name "Carlos") |
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CarlosPindle |
Humor & Laughter
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1 |
1,428 |
05-08-2023, 11:30 PM |
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Thread: why Astron uses a "decide for yourself" AP longitude
Post: RE: why Astron uses a "decide for yourself" AP lon...
| Peter,
That explains why they call it an "assumed position" and not exact position (or fix). And I see the reasoning now for Astron's Ap.
Thanks for the thoroughness of the above writing.
Ca... |
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CarlosPindle |
General Topics Here
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2 |
1,656 |
03-30-2023, 11:20 PM |
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Thread: A Source of Confusion in Selecting an Assumed Position
Post: RE: A Source of Confusion in Selecting an Assumed ...
| Hi All,
I'm confused by the result I got using Astron here- https://friendsofthevigilance.org.uk/Astron/Astron.html
Note- Astron DOES NOT use DR Latitude or DR Longitude. It was Assumed Latitude an... |
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CarlosPindle |
General Topics Here
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8 |
4,915 |
03-30-2023, 12:27 AM |
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Thread: A Source of Confusion in Selecting an Assumed Position
Post: RE: A Source of Confusion in Selecting an Assumed ...
| Peter,
That's a very good explanation and makes it much simpler to understand and easier to carry out.
I'm curious, do people still do Ageton reductions? I've given it a try several times and hav... |
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CarlosPindle |
General Topics Here
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8 |
4,915 |
03-28-2023, 01:05 PM |
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Thread: Hello
Post: RE: Hello
| Peter,
Ah, now I understand. So then using meridian t is only for certain sight reduction methods. That makes sense.
Now I FINALLY understand it (it has been years of confusion).
Thank you,... |
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CarlosPindle |
The Sight Reduction process
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11 |
5,317 |
03-11-2023, 03:47 PM |
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Thread: Hello
Post: RE: Hello
| Peter,
Will you please explain the meridian t angle stuff. I've read about it but it has always been too difficult to understand. Why not just use LHA?
Thanks,
Carlos |
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CarlosPindle |
The Sight Reduction process
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11 |
5,317 |
03-10-2023, 02:47 PM |
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Thread: Star of India navigation
Post: RE: Star of India navigation
| Really enjoyed the video!
Oh the happy days of wind! What a magnificent ship.
It was a beautiful sight to see a sextant and sight reduction.
Wonderful.
Carlos |
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CarlosPindle |
General Topics Here
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2 |
3,715 |
02-22-2021, 09:14 PM |
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Thread: North Magnetic Pole just crossed Prime Meridian
Post: RE: North Magnetic Pole just crossed Prime Meridia...
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pabrides Wrote: (02-12-2021, 07:51 AM)
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Fred_B Wrote: (02-12-2021, 01:19 AM)
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Had no idea the magnetic pole moved that much. Speaking of compasses- compasses that are useful in one hemisphere (... |
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CarlosPindle |
The Sight Reduction process
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7 |
7,921 |
02-12-2021, 12:47 PM |
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Thread: Covid shots
Post: RE: Covid shots
| Here's an idea to try;
Make several observations for longitude- a few before MP and the same amount after MP. Carry out "the meridian by equal altitudes" method.
My amateur guess is the error w... |
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CarlosPindle |
The Sight Reduction process
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7 |
5,960 |
12-24-2020, 12:01 AM |
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Thread: Celestial Nav problem I can't solve
Post: RE: Celestial Nav problem I can't solve
| Ray, I think you're correct that the Index Correction they're speaking of is what must be added to the Hs. They're calling it Index Correction and not Index Error.
My complaints are the time for... |
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CarlosPindle |
General Topics Here
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12 |
13,571 |
04-30-2020, 12:37 PM |
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Thread: What Time is it?
Post: RE: What Time is it?
| Matey,
Joe your idea is terrific and simple. I've seen photos of transit telescopes (not Transit in the sense of surveying) that are at Greenwich and have found the idea fascinating.
Oh...ano... |
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CarlosPindle |
General Topics Here
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15 |
24,879 |
10-04-2018, 11:29 AM |
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Thread: A good night for Practice..
Post: RE: A good night for Practice..
| All was a glorious sight!
Joe, thanks for the "heads-up". That was a wonderful display! Yes, you're so right- a few, hundreds, thousands or millions of light years to reach our eyes. And you wer... |
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CarlosPindle |
General Topics Here
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2 |
5,869 |
09-23-2018, 12:07 AM |
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Thread: Calculator inputs
Post: RE: Calculator inputs
| Joe,
Avast there! It's pretty simple. Yes, you can use the whole degree figures for Ap latitude (Assumed position latitude) Declination and LHA. But, to make it more accurate you should use the ... |
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CarlosPindle |
The Sight Reduction process
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2 |
4,516 |
08-31-2018, 09:31 AM |
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Thread: How to use TABLE 4- Sun's GHA and Declination for years 2001 to 2036
Post: RE: How to use TABLE 4- Sun's GHA and Declination ...
| Joe,
CelNav's explanation only uses the example time and date of January 22, 2017 GMT 17:20:14. It's easy enough to figure out any other date and time.
If the time had been 17:38:14 then the fi... |
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CarlosPindle |
How to use TABLE 4- Sun's GHA and Declination for years 2001 to 2036
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4 |
9,672 |
07-12-2018, 12:26 PM |
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Thread: Doesn't matter which row or column in Table 5?
Post: RE: Doesn't matter which row or column in Table 5?
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Rdutton Wrote: (06-13-2017, 10:29 AM)
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Ed & Rumata,
Table 5 in Pub. No. 249 gave me the same results you're describing.
Thanks to Rumata, Pub. No. 229 gives the basic formula as seen below.... |
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CarlosPindle |
The Sight Reduction process
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7 |
10,500 |
07-09-2018, 11:26 PM |
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Thread: LOP plotting question
Post: RE: LOP plotting question
| BigBill,
No, I don't. However, I was reading last night in Pub. No. 229 vol 1. page xv (pdf page 16) and found "C. Special Techniques" and section "1. Adjustment of Straight Line of Position."
Sec... |
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CarlosPindle |
General Topics Here
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11 |
14,485 |
06-22-2018, 11:09 AM |
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Thread: Marine weather....here?!
Post: RE: Marine weather....here?!
| Joe, I suspect you could teach us a great deal about wx prediction or determination.
Call me stupid but I still have no idea how to understand Low or High pressure systems in the Northern hemisphe... |
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CarlosPindle |
Marine Weather
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6 |
9,056 |
06-09-2018, 12:59 AM |
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Thread: Added- Moon phases and Table 3
Post: RE: Added- Moon phases and Table 3
| Herman,
That's pretty nice. Do you know where to get the moon phase card or program so that I can make one for any year?
Carlos |
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CarlosPindle |
General Topics Here
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6 |
8,034 |
04-14-2018, 08:38 PM |
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Thread: AP in the east.
Post: RE: AP in the east.
| I'm in the Western & Northern hemisphere and haven't had any experience in working an Eastern longitude problem.
Wannathermal, could you give us an example for better clarification? Ap only is use... |
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CarlosPindle |
The Sight Reduction process
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17 |
19,616 |
03-03-2018, 03:11 PM |
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Thread: Analog or Digital time display
Post: RE: Analog or Digital time display
| Analog is beautiful and digital is ugly....except when it comes to taking a sight. A digital watch is very good as you don't have to "think" about what you're seeing and the need to interpret the tim... |
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CarlosPindle |
General Topics Here
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2 |
6,091 |
10-25-2017, 03:06 AM |
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Thread: No GPS? Follow the North star! (poor people)
Post: No GPS? Follow the North star! (poor people)
| I happened upon a website which is by an artist, Sam Kerson who is a creator of the arts and is presently, with his wife, in Italy observing the refugee influx from various impoverished and torn-by-wa... |
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CarlosPindle |
General Topics Here
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0 |
2,782 |
10-06-2017, 11:31 PM |
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Thread: This is a great resource
Post: RE: This is a great resource
| BigBill,
I feel the same way. It's a "one stop" shop for everything. Have you tried the compact Nautical Almanacs? They fit the daily pages for 3 days on 1 page (Aries, planets, stars, Sun, Moon... |
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CarlosPindle |
General Topics Here
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1 |
4,753 |
06-02-2017, 04:51 PM |
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Thread: Great Circle route difficulty
Post: RE: Great Circle route difficulty
| BigBill,
This might not help you directly but have you read Bowditch Chapter 24, "The Sailings"?
Get it here- The Sailings (https://thenauticalalmanac.com/Bowditch-%20American%20Practical%20Navi... |
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CarlosPindle |
General Topics Here
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4 |
8,694 |
04-23-2017, 02:55 AM |
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Thread: Moon & Jupiter April 11
Post: RE: Moon & Jupiter April 11
| At my present longitude of W 072° it was too light out to see anything at GMT 21. 'Did see them later and it was beautiful. |
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CarlosPindle |
General Topics Here
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2 |
5,043 |
04-12-2017, 06:32 PM |
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Thread: Limb to use- Upper or Lower?
Post: RE: Limb to use- Upper or Lower?
| BigBill,
Have you tried placing it on the railing of your deck or directly over the deck's beam?
It's messier but have you tried using oil instead of water?
Carlos |
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CarlosPindle |
The Sight Reduction process
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11 |
19,049 |
03-21-2017, 10:06 PM |
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Thread: Stellarium- finding stars
Post: RE: Stellarium- finding stars
| BigBill,
Stellarium is very helpful and once you learn the names and the positions of the stars then it's easy to find them again.
The Rude (stupid name) 2102D star finder is easy to use. Have... |
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CarlosPindle |
General Topics Here
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11 |
19,653 |
03-17-2017, 02:24 AM |
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Thread: Marine weather....here?!
Post: RE: Marine weather....here?!
| Marine wx is probably a necessary hobby of us. Often the weather man is wrong. Most of them on TV look like they're dancing in front of a huge screen TV while flailing their arms about describing th... |
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CarlosPindle |
Marine Weather
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6 |
9,056 |
02-09-2017, 12:04 AM |
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Thread: How to use TABLE 4- Sun's GHA and Declination for years 2001 to 2036
Post: RE: How to use TABLE 4- Sun's GHA and Declination ...
| Good work! You have made it very easy to understand.
I've stayed away from Table 4 for years. Sometimes I got the correct result but mostly not so.
Very much appreciate the explanation.
Car... |
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CarlosPindle |
How to use TABLE 4- Sun's GHA and Declination for years 2001 to 2036
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4 |
9,672 |
01-26-2017, 10:14 PM |
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Thread: Close GHA determination using EoT
Post: Close GHA determination using EoT
| You can determine GHA, closely, of an integral hour by taking the EoT (Equation of Time) and converting it to an angle and then subtracting or adding it to the GMT integral hour (converted to an angle... |
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CarlosPindle |
General Topics Here
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2 |
5,840 |
01-13-2017, 02:10 PM |
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Thread: Pub No. 249 star sight reduction
Post: Pub No. 249 star sight reduction
| Just saw that TheNauticalAlmanac.com now has listed the procedure for how to perform a sight reduction using Ho 249/Pub No. 249.
Here it is- Star sight reduction Pub. No. 249 Vol. 1 (https://thenau... |
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CarlosPindle |
The Sight Reduction process
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0 |
2,761 |
11-11-2016, 01:07 PM |
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Thread: Landfall procedure?
Post: RE: Landfall procedure?
| So then all you do is follow the Sun line (once it is passing through your destination) to the destination?
How do you make sure you're turning toward the destination and not away from it? |
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CarlosPindle |
General Topics Here
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10 |
16,257 |
11-11-2016, 01:02 PM |
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Thread: Davis Mark 15 plastic sextant
Post: Davis Mark 15 plastic sextant
| Just got a Davis Mark 15 plastic sextant. Did a few sun sights and found the LOPs to be acceptable. Not as good at the Astra III-B but fair.
The index mirror is a 2nd surface mirror.
The nice ... |
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CarlosPindle |
General Topics Here
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0 |
3,783 |
11-11-2016, 12:50 PM |
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Thread: Sun sights during cloudy weather
Post: Sun sights during cloudy weather
| The clouds aren't always cooperative when taking shots of the Sun. The Sun partially peeking through an overcast sky can often be useful when using the correct filter. What I mean is the Sun often a... |
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CarlosPindle |
The Sight Reduction process
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1 |
5,939 |
12-21-2015, 06:47 PM |
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Thread: Forms
Post: RE: Forms
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jackdale Wrote: (12-17-2015, 10:26 PM)
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I used a form from backbearing.com on a South Atlantic crossing and modified it somewhat. It has space for a forenoon, noon and afternoon site.
http://w... |
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CarlosPindle |
The Sight Reduction process
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16 |
30,326 |
12-18-2015, 01:52 AM |
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Thread: Pencil or pens- which to use
Post: RE: Pencil or pens- which to use
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jackdale Wrote: (12-17-2015, 10:59 PM)
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CarlosPindle Wrote: (12-17-2015, 05:03 AM)
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jackdale Wrote: (12-16-2015, 04:09 PM)
--
All of my nav (celestial or coastal) work is done with a .9 mm mech... |
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CarlosPindle |
The Sight Reduction process
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4 |
10,169 |
12-18-2015, 01:48 AM |
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Thread: Pencil or pens- which to use
Post: RE: Pencil or pens- which to use
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jackdale Wrote: (12-16-2015, 04:09 PM)
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All of my nav (celestial or coastal) work is done with a .9 mm mechanical pencil. More sturdy than the .5 mm or .7 mm
--
Do you mean one of the old sty... |
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CarlosPindle |
The Sight Reduction process
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4 |
10,169 |
12-17-2015, 05:03 AM |
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Thread: Forms
Post: RE: Forms
| Roland,
Many forms provide a space for CE. My assumption is that when I take a shot, record the time and then the Hs that I already know what my chronometer error is and the time is adjusted up or... |
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CarlosPindle |
The Sight Reduction process
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16 |
30,326 |
12-16-2015, 01:39 AM |
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Thread: Stellarium- finding stars
Post: Stellarium- finding stars
| The program, Stellarium, I've found to be helpful in figuring out the doubtful position of navigational stars. Similar to the problem of, "I just shot a certain star but am not sure what its name is"... |
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CarlosPindle |
General Topics Here
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11 |
19,653 |
12-16-2015, 01:12 AM |
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Thread: Full UPS or small sheet
Post: Full UPS or small sheet
| Hello everyone,
The full sized UPS are ok but I like to use a small 8-1/2 x 11 sheet printed off or just making one using Bowditch method in Chapter 26- Emergency Navigation section 2603. Very eas... |
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CarlosPindle |
General Topics Here
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2 |
6,389 |
12-15-2015, 01:53 PM |
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Thread: Determine Latitude- method
Post: RE: Determine Latitude- method
| CelNav57,
What you've written is very helpful and simple to follow. Will give it a try today if the the wx stays clear!
Carl P |
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CarlosPindle |
General Topics Here
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4 |
9,768 |
12-15-2015, 01:37 PM |
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Thread: Cleaning shades and mirror?
Post: RE: Cleaning shades and mirror?
| Clendon,
Spray some distilled water on mirror and wipe it off with a soft cloth. Same with the shades. That's what I do.
Carl P. |
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CarlosPindle |
General Topics Here
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6 |
16,562 |
12-15-2015, 01:35 PM |
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Thread: Venus magnitude -4.0
Post: Venus magnitude -4.0
| Hello all,
Got a series of good shots of Venus this morning at around UTC 11 and will be trying my first planet sight reduction.
In The Nautical Almanac, for Venus, there's a "v" correction. I ... |
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CarlosPindle |
The Sight Reduction process
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11 |
21,306 |
12-15-2015, 01:32 PM |
