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Thread: How to get LHA and Ap longitude in Eastern longitudes
Post: RE: How to get LHA and Ap longitude in Eastern lon...
From the 2023 Air Almanac are examples of Eastern longitude problems. See the attached screen shot at the bottom herein.
Look at the examples for only Aries and Aldebaran.
In these cases you ... |
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EdCa |
General Topics Here
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15 |
7,549 |
04-08-2023, 12:05 PM |
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Thread: How to get LHA and Ap longitude in Eastern longitudes
Post: RE: How to get LHA and Ap longitude in Eastern lon...
I've got an easier way to get LHA....just for us simple folks.
Get an approximate LHA using the "simple method"- one that's either plus or minus 1°. Compare the uncorrected Hc figure found in Pub.... |
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EdCa |
General Topics Here
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15 |
7,549 |
04-07-2023, 09:58 PM |
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Thread: How to get LHA and Ap longitude in Eastern longitudes
Post: RE: How to get LHA and Ap longitude in Eastern lon...
Hello Peter,
I reduced and plotted the LOP using your 249 commercial attachment. Yes, you're correct that the LOP's with my method and yours do pass over top of each other. The problem with my me... |
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EdCa |
General Topics Here
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15 |
7,549 |
04-07-2023, 03:02 PM |
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Thread: How to get LHA and Ap longitude in Eastern longitudes
Post: RE: How to get LHA and Ap longitude in Eastern lon...
Uh oh.....I better go back to the drawing board. I thought I had it figured out!
Will study the problem.
I'm trying to find in Bowditch or '249 an explanation for the necessity of finding Ap lo... |
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EdCa |
General Topics Here
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15 |
7,549 |
04-03-2023, 08:18 PM |
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Thread: How to get LHA and Ap longitude in Eastern longitudes
Post: How to get LHA and Ap longitude in Eastern longitu...
Hi gents. Here's the answer to this confusing situation. It's much simpler than you can imagine. Pub. No. 249 Vol. 2 page. xi does a pretty BAD job of showing how to get LHA and the Ap longitude us... |
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EdCa |
General Topics Here
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15 |
7,549 |
04-01-2023, 08:57 PM |
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Thread: new artificial horizon
Post: RE: new artificial horizon
That's a very good idea. Here's something to make it, sometimes, easier (which you probably already know);
- Setup your horizon as mentioned.
- From the location on your property where you'll be ... |
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EdCa |
The Sight Reduction process
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3 |
3,674 |
02-27-2021, 07:28 PM |
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Thread: warning - graphic content
Post: RE: warning - graphic content
Just read about President Duterte and what he wants to do for the Philippines relative to the US. Glad I'm not him. They'll probably do a JFK on him. Poor guy.
Ed |
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EdCa |
General Topics Here
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4 |
4,252 |
02-20-2021, 01:37 PM |
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Thread: NO ATHEISTS IN A STORM
Post: RE: NO ATHEISTS IN A STORM
pabrides Wrote: (02-11-2021, 06:07 AM)
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Just Like the lack of atheism in foxholes, there are no atheists in a storm at sea.
No one knows this better than the author of THE SQUARE RIGGED CRUISE... |
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EdCa |
General Topics Here
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2 |
3,451 |
02-11-2021, 11:23 PM |
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Thread: Covid shots
Post: RE: Covid shots
pabrides,
All of your final figures are correct.
As we all know, mostly by experience, an accuracy close to 4 or 5 nm is excellent....while at sea.
Here's an idea to try- remove your sextant's te... |
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EdCa |
The Sight Reduction process
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7 |
5,906 |
12-23-2020, 03:29 PM |
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Thread: Celestial Nav problem I can't solve
Post: RE: Celestial Nav problem I can't solve
Ray,
What is meant by "the time diagram"? Perhaps they mean converting E 163° 51' to time difference from GMT. If that's so the difference is either 11 hours or 10 hours 56 minutes.
To begin, ... |
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EdCa |
General Topics Here
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12 |
13,488 |
04-29-2020, 01:46 AM |
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Thread: ABC Tables Azimuth Value
Post: RE: ABC Tables Azimuth Value
Maties,
This might be of some help;
https://thenauticalalmanac.com/Formulas.html#Determine_Z
Ed |
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EdCa |
The Sight Reduction process
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5 |
10,614 |
11-10-2018, 12:46 PM |
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Thread: Nories tables?
Post: RE: Nories tables?
BigBill,
Here ya' go- https://archive.org/details/acompletesetnau00norigoog
...or here- http://books.google.com/books?id=OzwEAAAAQAAJ&dq=nories+nautical+tables&printsec=frontcover&source=bl&ots... |
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EdCa |
General Topics Here
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3 |
6,214 |
09-08-2018, 01:01 AM |
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Thread: First time real horizon
Post: RE: First time real horizon
BigBill,
What a clever sextant the Mark 3 is! You weren't far off in your sights. They were close enough. Did you find the mirror moved a lot and that's why you needed to adjust it?
Did you b... |
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EdCa |
General Topics Here
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5 |
8,209 |
07-25-2018, 09:15 PM |
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Thread: Corrupted HP table
Post: RE: Corrupted HP table
[quote pid='574' dateline='1531367588']
OK, Ed, I stand corrected !!! The second HP table is NOT errant.
I chewed on a sample moon shot and found both table answers exactly the same... Its curious ... |
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EdCa |
The Sight Reduction process
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5 |
8,720 |
07-14-2018, 09:01 PM |
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Thread: Corrupted HP table
Post: RE: Corrupted HP table
The table isn't errant but does require the following;
Total Moon Altitude Correction=
Add SD (semi-diameter) if LL (Lower Limb) shot.
Subtract SD (semi-diameter) if LL (Upper Limb) shot.
Su... |
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EdCa |
The Sight Reduction process
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5 |
8,720 |
07-11-2018, 10:37 AM |
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Thread: Table 4
Post: RE: Table 4
CelNav wrote an explanation for using Table 4 which makes it much simpler to understand.
I don't think Table 4, as presented, was written for mortals.
See his explanation here- https://thenauti... |
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EdCa |
The Sight Reduction process
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3 |
4,975 |
07-11-2018, 10:31 AM |
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Thread: new generations of doubt
Post: RE: new generations of doubt
Joe,
All of what you said was true. No indoor plumbing but you sure could find where you are anywhere on the globe!
They'll believe you when their batteries are not replaceable!
Ed |
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EdCa |
Humor & Laughter
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1 |
3,295 |
06-18-2018, 10:55 AM |
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Thread: Where are the Charts
Post: RE: Where are the Charts
Joe,
Good question! I did a quick search for charts and didn't find much. But, I did find this;
https://openseachart.org/doku.php/enc
Go to the bottom of the page and you'll find a listing for So... |
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EdCa |
General Topics Here
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2 |
4,498 |
06-09-2018, 12:42 AM |
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Thread: Video- Concise Sight Reduction Tables
Post: RE: Video- Concise Sight Reduction Tables
BigBill,
People give their souls to Youtube. Good for you!
Better days....
Ed |
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EdCa |
The Sight Reduction process
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8 |
12,927 |
03-22-2018, 09:30 PM |
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Thread: We're Sinking!!!
Post: We're Sinking!!!
A very important May-Day call!
https://www.youtube.com/watch?v=0MUsVcYhERY |
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EdCa |
Humor & Laughter
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0 |
2,163 |
03-09-2018, 11:13 PM |
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Thread: Filters
Post: RE: Filters
I was reading about an UV lamp that kills bacteria in a domestic water supply. The directions said to only view the UV light through a normal pane of glass. So, the glass filters on our sextants wil... |
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EdCa |
General Topics Here
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6 |
9,327 |
02-28-2018, 11:14 AM |
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Thread: Just trying to be nice
Post: RE: Just trying to be nice
So true- the extra battery!!! Oh no.....my phone's dead!!!! Map? What's that?
"Splice the main brace" mates!
Happy new year and merry Christmas! |
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EdCa |
General Topics Here
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3 |
6,262 |
12-23-2017, 12:24 AM |
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Thread: Astron Excel sight reduction manual almanac
Post: RE: Astron Excel sight reduction manual almanac
Rumata, you're right- that work is good for practice and keeping us sharp. It's surprising with the St. Hillaire method if there's an error in the reduction the intercept comes up as preposterous. T... |
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EdCa |
The Sight Reduction process
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6 |
9,976 |
10-04-2017, 10:22 PM |
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Thread: Astron Excel sight reduction manual almanac
Post: RE: Astron Excel sight reduction manual almanac
Rumata,
You'll find the Lower, Upper, Center limb area of the reduction around column I and row 27. Enter in column cell I31 (eye 31) L for Lower, U for Upper or C for center.
I assume refracti... |
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EdCa |
The Sight Reduction process
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6 |
9,976 |
10-02-2017, 11:17 AM |
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Thread: How to buy a sextant
Post: RE: How to buy a sextant
James,
Yes, I would look for a distributor for them.
Cassens & Plath "find a distributor" here- http://www.nauticexpo.com/prod/cassens-plath/product-21864-50596.html
Freiberger- http://www.se... |
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EdCa |
General Topics Here
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8 |
16,690 |
08-02-2017, 09:03 PM |
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Thread: How to buy a sextant
Post: RE: How to by a sextant
James,
It mostly depends on how much you want to pay. Carl Plath sextants are usually expensive but very high quality. Tamaya are very good too. Celestaire has theirs made in China (what a surpr... |
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EdCa |
General Topics Here
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8 |
16,690 |
08-01-2017, 10:52 PM |
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Thread: Planning for twilight phenomena observation
Post: RE: Planning for twilight phenomena observation
Rumata- you've got a great idea which isn't that complex to solve, just like you wrote about above.
My guess is you could determine, very, very roughly, longitude by the time of sunset or twilight.... |
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EdCa |
The Sight Reduction process
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5 |
9,221 |
07-03-2017, 06:04 PM |
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Thread: Doesn't matter which row or column in Table 5?
Post: Doesn't matter which row or column in Table 5?
Here's and odd question- does it matter whether you use the column for minutes of declination or "d" correction from Pub. No. 249 to get the proper "d" correction? By this I mean I've discovered that... |
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EdCa |
The Sight Reduction process
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7 |
10,456 |
05-16-2017, 01:29 AM |
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Thread: Why Polaris isn't listed?
Post: RE: Why Polaris isn't listed?
Rumata,
Welcome aboard!
It's a further curiosity to notice on the USNO's Navigational Star Chart that Polaris, while it's listed with a general SHA of about 328° that there isn't a number next... |
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EdCa |
The Sight Reduction process
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14 |
22,313 |
04-20-2017, 07:41 PM |
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Thread: Limb to use- Upper or Lower?
Post: RE: Limb to use- Upper or Lower?
BigBill Wrote: (03-18-2017, 04:47 PM)
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Old thread but here's my opinion.
I use an AH and prefer to superimpose the images, partly because then I don't have to do the u/l limb corrections, partly b... |
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EdCa |
The Sight Reduction process
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11 |
18,989 |
03-18-2017, 05:32 PM |
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Thread: Sun sights during cloudy weather
Post: RE: Sun sights during cloudy weather
CarlosPindle Wrote: (12-21-2015, 06:47 PM)
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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 ... |
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EdCa |
The Sight Reduction process
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1 |
5,912 |
12-22-2015, 11:23 AM |
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Thread: Problem using Moon Altitude Correction Table
Post: RE: Problem using Moon Altitude Correction Table
Paul, you're correct. The left hand side of the page under the App. Alt. is only the minutes of Ha.
Ed |
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EdCa |
The Sight Reduction process
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1 |
4,219 |
12-22-2015, 04:22 AM |
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Thread: Star finder- Rude 2102-D
Post: RE: Star finder- Rude 2102-D
craigsl Wrote: (12-19-2015, 01:14 AM)
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Got the 2102-d star finder from Weems & Plath a few months ago and have been enjoying the ease and simplicity of it.
Previously, but still, I use the USNO'... |
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EdCa |
The Sight Reduction process
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2 |
9,025 |
12-19-2015, 01:19 PM |
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Thread: Writing down sights
Post: RE: Writing down sights
A while back I tried a "leg board" like pilots use. It was ok but tended to drift down my leg. Perhaps an "arm board" would be better?
Until then- index cards on a split ring work well.
Ed |
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EdCa |
The Sight Reduction process
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2 |
5,086 |
12-18-2015, 02:39 PM |
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Thread: Fastest sight reduction you've done
Post: Fastest sight reduction you've done
Like everything in celnav sight reduction takes time.
What's the fastest Sun sight reduction you have carried out?
Just the time from when you store the sextant and sit down to begin the pape... |
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EdCa |
The Sight Reduction process
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1 |
5,113 |
12-18-2015, 02:37 PM |
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Thread: Limb to use- Upper or Lower?
Post: RE: Limb to use- Upper or Lower?
Mostly I use the LL when on the hard. It's easier to reduce for me. Just a preference. |
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EdCa |
The Sight Reduction process
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11 |
18,989 |
12-18-2015, 02:33 PM |
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Thread: Full UPS or small sheet
Post: RE: Full UPS or small sheet
CarlosPindle Wrote: (12-15-2015, 01:53 PM)
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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 2... |
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EdCa |
General Topics Here
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2 |
6,374 |
12-18-2015, 02:29 PM |
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Thread: Determine Latitude- method
Post: RE: Determine Latitude- method
Have you ever shot for Latitude without using a chronometer? Did the results come out correct?
Ed |
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EdCa |
General Topics Here
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4 |
9,745 |
12-18-2015, 02:13 PM |
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Thread: Does anyone really shoot the Moon?
Post: RE: Does anyone really shot the Moon?
Many moons ago....I did. Once in a long while I still take a few shots (of the moon) just to stay in practice and use a filter on the horizon so to not get the Hs wrong. The brightness of a full moon... |
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EdCa |
The Sight Reduction process
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8 |
15,859 |
12-17-2015, 12:52 PM |
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Thread: On the sea while on the hard
Post: RE: On the sea while on the hard
Fred_B Wrote: (12-16-2015, 05:29 PM)
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Standing on a beach on the East coast of the US is good practice for sights made while on the ocean. Except one big problem- SAND!! It teaches you a new regar... |
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EdCa |
General Topics Here
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1 |
5,868 |
12-17-2015, 12:46 PM |