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Thread: Don't lose heart.....
Post: Don't lose heart.....
| Celestial navigation isn't particularly easy- especially when you're tired and cold and forgot even the simplest of things about it. Sextant...whats a sextant? Oh, I remember...he's a janitor in a c... |
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CelNav57 |
General Topics Here
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0 |
938 |
03-30-2023, 01:00 AM |
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Thread: 2024- Everything You Need
Post: 2024- Everything You Need
| I've just added a new page where you can get everything you need for 2024 Celestial Navigation.
Click here- Everything you need for 2024 (https://thenauticalalmanac.com/Everything_You_Need_For_2... |
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CelNav57 |
2024- Everyting You Need
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0 |
1,394 |
01-09-2023, 07:23 PM |
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Thread: LHA in Eastern longitudes?
Post: LHA in Eastern longitudes?
| I'm at a loss to understand how to calculate LHA while sailing in Eastern longitudes.
What I know;
LHA in Eastern longitudes= GHA + ApL (Assumed position longitude) (minus 360° if necessary)
... |
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CelNav57 |
General Topics Here
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5 |
4,136 |
11-25-2022, 02:30 PM |
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Thread: Bowditch 2019- The American Practical Navigator
Post: Bowditch 2019- The American Practical Navigator
| The American Practical Navigator (Bowditch) 2019 version is on the site.
It's perfectly organized by Sections and Chapters allowing you to easily find and download the material you want.
You ca... |
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CelNav57 |
Bowditch 2019- The American Practical Navigator
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0 |
1,539 |
12-23-2020, 02:34 PM |
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Thread: New Almanac format
Post: New Almanac format
| All of The Nautical Almanacs have been updated to a better format for viewing.
Improvements are as follows;
- Moon phase graphic
- GHA time separated into 6 hour increments
- Latitude (N or S)... |
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CelNav57 |
General Topics Here
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0 |
3,333 |
06-19-2019, 12:45 PM |
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Thread: What Time is it?
Post: RE: What Time is it?
| Matey,
You've done some excellent research work. I edited your post above as the email addresses were not obscured to protect the privacy of both you and the gentleman from Cornell. The hyper link ... |
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CelNav57 |
General Topics Here
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15 |
24,879 |
11-04-2018, 12:54 AM |
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Thread: 2017 Bowditch- The American Practical Navigator
Post: 2017 Bowditch- The American Practical Navigator
| Bowditch 2017 has just been uploaded to the site.
2017 Bowditch- American Practical Navigator (https://thenauticalalmanac.com/2017_Bowditch-_American_Practical_Navigator.html)
It's organized sequent... |
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CelNav57 |
General Topics Here
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3 |
6,239 |
08-11-2018, 12:02 AM |
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Thread: TABLE 5
Post: RE: TABLE 5
| Joe,
Table 5 is used to correct the declination change that is found in using Pub. No. 249. The "d" value found in the middle column of each page of latitude, in Pub. No. 249, is used, along with... |
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CelNav57 |
The Sight Reduction process
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2 |
4,415 |
07-03-2018, 12:09 PM |
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Thread: Sextant wanted and other questions
Post: RE: Sextant wanted and other questions
| Joe,
The addition of the HP correction chart for the moon in Increments & Corrections-
https://thenauticalalmanac.com/Increments%20&%20Corrections%20Table.pdf
...is helpful but the Altitude Correcti... |
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CelNav57 |
Equipment- Wanted or for Sale
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4 |
9,203 |
06-09-2018, 01:12 AM |
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Thread: Conversion of Arc to Time- new table
Post: Conversion of Arc to Time- new table
| TABLE 3- Conversion of Arc to Time from Pub. No. 249 has been replaced by a new one I made. It has also been added into The Nautical Almanac for years 2018, 2019, 2020.
You can get it here too-
... |
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CelNav57 |
General Topics Here
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0 |
3,082 |
04-21-2018, 01:00 PM |
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Thread: Added- Moon phases and Table 3
Post: RE: Added- Moon phases and Table 3
| Herman's Moon Phase pdf inspired efforts to find Moon Phase charts for any year. I found the solution but it wasn't easy as most of the charts are for sale in printed form.
A website- https://www.da... |
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CelNav57 |
General Topics Here
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6 |
8,034 |
04-18-2018, 10:36 PM |
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Thread: Added- Moon phases and Table 3
Post: RE: Added- Moon phases and Table 3
| Herman,
A date based on GMT/UTC is often different than local time. For example; January 2, 2018 the full moon is at GMT 02:24. Based on Local Time in the Eastern United States full moon would oc... |
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CelNav57 |
General Topics Here
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6 |
8,034 |
04-14-2018, 10:24 PM |
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Thread: Added- Moon phases and Table 3
Post: RE: Added- Moon phases and Table 3
| Several aspects of the card are very good. At a quick glance you can see what phase the moon is. "A picture is worth a thousand words". And, frankly, most of of us think that way- it's better to se... |
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CelNav57 |
General Topics Here
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6 |
8,034 |
04-14-2018, 08:34 PM |
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Thread: Added- Moon phases and Table 3
Post: Added- Moon phases and Table 3
| I've added a few pages to the 2018 and 2019 Nautical Almanac;
- 2018 and 2019 Moon Phases
- TABLE 3- Conversion of Arc to Time
Perhaps you'll find them useful?
As time permits The Nautical... |
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CelNav57 |
General Topics Here
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6 |
8,034 |
04-13-2018, 12:56 AM |
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Thread: Navigational Star Chart- how to use it for star identification
Post: Navigational Star Chart- how to use it for star id...
| I've just written up a procedure for finding which stars will be on your meridian, generally, on the first day of each month of the year at 7PM Local Standard Time.
It uses the USNO's Navigational ... |
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CelNav57 |
Navigational Star Chart- how to use it for star identification
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1 |
5,785 |
12-23-2017, 01:01 AM |
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Thread: Desperate Voyage
Post: Desperate Voyage
| At Rumata's suggestion I purchased and received, today, a copy of John Caldwell's book, "Desperate Voyage". The book came autographed by John Caldwell himself! All for $3.85 from ebay! In brief the... |
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CelNav57 |
General Topics Here
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3 |
6,639 |
10-15-2017, 02:20 AM |
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Thread: book- Two Years Before the Mast
Post: RE: book- Two Years Before the Mast
| Rumata,
By your recommendation I just purchased it a few minutes ago, used, from Ebay.
Thanks again!
CelNav (though I'm much older than 57) |
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CelNav57 |
General Topics Here
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4 |
7,803 |
10-06-2017, 12:31 AM |
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Thread: book- Two Years Before the Mast
Post: book- Two Years Before the Mast
| Rumata has recommended a very good book- Two Years Before the Mast.
Get it here, free;
Two Years Before the Mast (https://archive.org/details/twoyearsbeforema02dana)
It was written by Richard... |
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CelNav57 |
General Topics Here
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4 |
7,803 |
09-26-2017, 12:39 AM |
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Thread: glitch in Calcs.
Post: RE: glitch in Calcs.
| Rumata,
I'm not sure what you're referring to. Do you mean the spreadsheet program Astron? If so, there are two versions of the program;
- Astron.xlsx (for Windows Excel)
- Astron.ods (for... |
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CelNav57 |
General Topics Here
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3 |
6,135 |
09-20-2017, 11:16 PM |
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Thread: Calendars for 2022 and 2023
Post: Calendars for 2022 and 2023
| Now you can get calendars for the years 2021 and 2022 which I call The Terrestrial Almanac.
Get them here- The Terrestrial Almanac (https://thenauticalalmanac.com/TerrestrialAlmanac.html)
The ca... |
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CelNav57 |
The Terrestrial Almanac- 2022 & 2023
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0 |
3,215 |
09-18-2017, 01:31 PM |
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Thread: Sighting the eclipse
Post: RE: Sighting the eclipse
| We just had very good success looking at the eclipse using the sextant and also allowing the unfiltered sun light to be projected through the telescope on to a piece of white paper. Focus the sun's i... |
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CelNav57 |
General Topics Here
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4 |
7,200 |
08-21-2017, 06:23 PM |
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Thread: Electronic Sextant G-Stell
Post: Electronic Sextant G-Stell
| A French company has invented an electronic sextant and named it G-Stell.
Here's a link to it.
G-Stell electronic sextant (http://starnav.fr/site/en/electronic-sextant-g-stell/)
I found it wh... |
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CelNav57 |
General Topics Here
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3 |
7,555 |
07-08-2017, 11:01 PM |
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Thread: Planning for twilight phenomena observation
Post: Planning for twilight phenomena observation
| Rumata had posted this question on another thread but I've moved and made a specific thread for his question as follows;
Gentlemen, I have a question regarding planning for twilight phenomena o... |
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CelNav57 |
The Sight Reduction process
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5 |
9,254 |
07-02-2017, 01:17 AM |
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Thread: Why Polaris isn't listed?
Post: RE: Why Polaris isn't listed?
| No, you're not making any mistakes.
Pub. No. 249 Vol 1. (7 varied navigational stars) provides stars that are brightest and best for producing an LOP with sharp angles between them. The magnitude ... |
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CelNav57 |
The Sight Reduction process
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14 |
22,390 |
05-05-2017, 02:01 AM |
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Thread: Why Polaris isn't listed?
Post: RE: Why Polaris isn't listed?
| Rumata,
I'm glad it worked out alright for you. Let me know if you ever need a Nautical Almanac for a specific year not already found on TheNauticalAlmanac.com and I'll make it for you in the format... |
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CelNav57 |
The Sight Reduction process
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14 |
22,390 |
04-22-2017, 12:14 AM |
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Thread: Why Polaris isn't listed?
Post: RE: Why Polaris isn't listed?
| Rumata,
I made a 1993 Nautical Almanac for you.
Get it here- 1993 Nautical Almanac (https://thenauticalalmanac.com/1993%20Nautical%20Almanac.pdf)
Please let me know if that works alright ... |
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CelNav57 |
The Sight Reduction process
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14 |
22,390 |
04-21-2017, 01:03 PM |
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Thread: Moon & Jupiter April 11
Post: Moon & Jupiter April 11
| This is late but Jupiter and the Moon are within a few degrees of each other.
On April 10 at GMT 21 Jupiter was 2° South of the Moon.
Perhaps you saw it?
Regardless, the view now, April 11 a... |
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CelNav57 |
General Topics Here
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2 |
5,043 |
04-11-2017, 02:36 AM |
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Thread: v for the sun
Post: RE: v for the sun
| Albyreto,
Maybe the following will be of some help. Bowditch in Chapter 19- THE ALMANACS page 3 (Bowditch overall page 289) explains why there's no v correction for the Sun. It's negligible. You ... |
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CelNav57 |
The Sight Reduction process
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6 |
9,631 |
04-06-2017, 01:43 PM |
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Thread: Moon alt correction with AH
Post: RE: Moon alt correction with AH
| Bill,
Bowditch Chapter 20- SIGHT REDUCTION provides information concerning a Moon sight reduction.
Here it is- 2008. Reducing a Moon Sight (https://thenauticalalmanac.com/Bowditch-%20American%20Prac... |
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CelNav57 |
The Sight Reduction process
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4 |
6,551 |
04-06-2017, 01:28 PM |
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Thread: Video- Concise Sight Reduction Tables
Post: Video- Concise Sight Reduction Tables
| BillofTheNorth has made an informative video on how to use Concise Sight Reduction Tables found in the USNO's Nautical Almanac.
It is well presented, enjoyable and very understandable.
Find it ... |
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CelNav57 |
The Sight Reduction process
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8 |
12,979 |
03-24-2017, 12:46 PM |
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Thread: GHA Aries Long term for years 2017-2025
Post: RE: GHA Aries Long term for years 2017-2025
| You are correct. "part a" uses the GHA of ♈ at GMT 00:00:00 for first day of the respective months. |
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CelNav57 |
GHA Aries Long term for years 2017-2025
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3 |
9,134 |
03-22-2017, 11:13 PM |
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Thread: GHA Aries Long term for years 2017-2025
Post: GHA Aries Long term for years 2017-2025
| GHA Aries Long Term for the years 2017 to 2025 has just been added to our site.
You'll find it under Essential Celestial Navigation downloads
The file is- Table 4 GHA ARIES FOR THE YEARS 2017-20... |
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CelNav57 |
GHA Aries Long term for years 2017-2025
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3 |
9,134 |
03-15-2017, 10:25 PM |
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Thread: Bowditch 2017- The American Practical Navigator for you
Post: Bowditch 2017- The American Practical Navigator fo...
| The American Practical Navigator (Bowditch) 2017 version has just been uploaded to the site.
It's perfectly organized by Sections and Chapters allowing you to easily find and download the material ... |
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CelNav57 |
Bowditch 2017- The American Practical Navigator
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1 |
5,436 |
03-02-2017, 06:55 AM |
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Thread: Pub. No. 229 all Volumes
Post: Pub. No. 229 all Volumes
| A page has been made just for Pub. No. 229 all Volumes
You can easily download individual Volumes covering a range of latitudes.
Pub. No. 229 web page (https://www.thenauticalalmanac.com/Pub.%20No.... |
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CelNav57 |
Pub. No. 229
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0 |
5,063 |
02-24-2017, 02:55 PM |
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Thread: Pub. No. 249- download Volumes or Latitudes. Epoch 2025
Post: Pub. No. 249- download Volumes or Latitudes. Epoch...
| A page has been made just for Pub. No. 249 Vol 1, 2 & 3
Vol. 1 is for Epoch 2025 and is provided courtesy of Celestaire.
You can easily download individual volumes or a range of Latitud... |
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CelNav57 |
Pub. No. 249- Epoch 2025
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0 |
6,435 |
02-24-2017, 02:53 PM |
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Thread: Instructions- Star sight reduction using Pub. 249 Vol. 1
Post: Instructions- Star sight reduction using Pub. 249 ...
| This has been up for a while.
Here's how to perform a star sight reduction using Pub. 249 Vol. 1
Go here- Methods (https://www.thenauticalalmanac.com/Methods.html) and scroll down to find this;... |
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CelNav57 |
CelNav Documents, Forms & Procedures
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0 |
6,287 |
02-14-2017, 02:44 PM |
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Thread: Marine weather....here?!
Post: Marine weather....here?!
| We thought it might be interesting to add a portion of the forum to the discussion of marine weather. It doesn't have much to do with celestial navigation but we do, hopefully, all utter the phrase, ... |
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CelNav57 |
Marine Weather
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6 |
9,056 |
02-08-2017, 09:56 PM |
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Thread: The problem of finding position at sea...in the 16th century
Post: The problem of finding position at sea...in the 16...
| I happened upon an interesting book, Maps of The Ancient Sea Kings by Charles H.Hapgood.
The book discusses a chart made or compiled by Piri Reis in about 1513. Though I'm no expert on the subject, ... |
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CelNav57 |
General Topics Here
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0 |
3,203 |
01-28-2017, 03:38 AM |
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Thread: How to use TABLE 4- Sun's GHA and Declination for years 2001 to 2036
Post: How to use TABLE 4- Sun's GHA and Declination for ...
| With a little effort you can get the Sun's GHA & Declination using TABLE 4. - GHA and Declination of the Sun for the Years 2001 to 2036- Argument “Orbit Time”.
It's printed on one sheet of paper.... |
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CelNav57 |
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, 02:09 PM |
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Thread: Video- Sailing for the Sun.
Post: Video- Sailing for the Sun.
| Here's a nice video in which the sailor is using a sextant.
It's his sailing trip across South Pacific, from Chile to New Zealand
Sailing for the Sun, video (https://youtu.be/Q3eE3cGXzUk?t=1... |
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CelNav57 |
General Topics Here
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0 |
3,033 |
01-20-2017, 03:39 AM |
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Thread: Formulas to determine Sunrise or Sunset
Post: RE: Formulas to determine Sunrise or Sunset
| You can also use HO-249 to get a fairly close estimate of Sunrise or Sunset.
All of the documents mentioned here are available on our website.
1- Enter HO-249 with the Latitude you'd like to find th... |
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CelNav57 |
General Topics Here
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1 |
43,317 |
05-30-2016, 01:50 PM |
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Thread: Formulas to determine Sunrise or Sunset
Post: Formulas to determine Sunrise or Sunset
| Here are a few simple formulas to determine Sunrise or Sunset time.
"Cos-1" means use the arc cosine key.
"Integral hour" means the single hour figure without minutes. Example- "12" not 12:14.
... |
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CelNav57 |
General Topics Here
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1 |
43,317 |
04-28-2016, 01:52 AM |
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Thread: Mercury Transit of the Sun's disk May 9, 2016
Post: Mercury Transit of the Sun's disk May 9, 2016
| Mercury will transit the Sun's disk on May 9 at GMT 11:12:00 and will exit 18:42:00
According to the USNO;
"The entire transit will be visible in eastern North America, northern South America, t... |
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CelNav57 |
General Topics Here
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1 |
4,702 |
04-18-2016, 11:53 PM |
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Thread: Penumbral eclipse of the Moon- March 23, 2016
Post: Penumbral eclipse of the Moon- March 23, 2016
| The following is from "Astronomical Phenomena for 2016" (USNO)
Get it here- Astronomical Phenomena for the year 2016 (http://aa.usno.navy.mil/publications/reports/ap16_for_web.pdf)
"A penumbral ec... |
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CelNav57 |
General Topics Here
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0 |
3,194 |
03-29-2016, 01:35 AM |
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Thread: What time is Spring, exactly?
Post: What time is Spring, exactly?
| Here's a question you may be interested in solving;
What is the date and time, in UT, of the 2016 vernal equinox?
Solve it anyway you'd like- just get the correct answer to the closest second ... |
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CelNav57 |
General Topics Here
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2 |
4,985 |
03-18-2016, 11:56 PM |
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Thread: March 8-9 total Solar eclipse
Post: March 8-9 total Solar eclipse
| The following is from The Astronomical Phenomena for 2016;
"A total eclipse of the Sun, March 8-9. See map on page 71. The eclipse begins at 23h 19m on March 8 and ends at 04h 35m on March 9".
... |
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CelNav57 |
General Topics Here
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0 |
2,982 |
03-08-2016, 12:09 PM |
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Thread: Amundsen- The South Pole
Post: RE: Amundsen- The South Pole
| Perhaps of special immediate interest are the interpretation of the Sun observations taken at the Pole by Amundsen and his men.
Appendix IV is taken directly from Roald Amundsen's The South Pole, ... |
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CelNav57 |
General Topics Here
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1 |
4,808 |
03-03-2016, 03:07 AM |
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Thread: Amundsen- The South Pole
Post: Amundsen- The South Pole
| Roald Amundsen wrote the account of his expedition of five Norwegians first to reach The South Pole on December 14, 1911.
The book is available for free here- The South Pole by Roald Amundsen (https:... |
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CelNav57 |
General Topics Here
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1 |
4,808 |
03-02-2016, 11:31 PM |
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Thread: Who bothers with Noon sights, and why?
Post: Who bothers with Noon sights, and why?
| The following is copied from part of JeremyParker's post over at; [/url]
[url=https://thenauticalalmanac.com/Forum/showthread.php?tid=14] (https://thenauticalalmanac.com/Forum/showthread.php?tid=14)
... |
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CelNav57 |
The Sight Reduction process
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2 |
7,371 |
02-29-2016, 02:18 PM |
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Thread: Venus magnitude -4.0
Post: RE: Venus magnitud -4.0
|
jeremyparker Wrote: (02-29-2016, 12:05 PM)
--
PS - apologies for the asterisk - I'm not sure where to find a degree symbol on this keyboard!
--
Welcome Jeremy! That was an excellent description.... |
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CelNav57 |
The Sight Reduction process
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11 |
21,306 |
02-29-2016, 12:47 PM |
