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-   -   Almanac and Celestial Navigation Calculator (https://www.cruisersforum.com/forums/f121/almanac-and-celestial-navigation-calculator-245458.html)

Jono as 2234 23-01-2021 12:51

Re: Almanac and Celestial Navigation Calculator
 
Brilliant. It brings back memories of vomiting below as one tried to work the sight and how next to impossible it was too get anything like an accurate sight when a small boat was jumping around.
Great effort to

picklesandjesse 23-01-2021 12:53

Re: Almanac and Celestial Navigation Calculator
 
Quote:

Originally Posted by Russ (Post 3326535)
Great Spread Sheets but how do I download to actually USE it.
Sorry not enough of a computer geek
Russ

I'm with you Russ.

grantmc 23-01-2021 14:06

Re: Almanac and Celestial Navigation Calculator
 
I think this is a fantastic effort and great work. Thanks too for making it public domain. I'll definitely get out the old sextant and give it a try.


Quote:

Originally Posted by double u (Post 3326408)
I always found the idea of combining a traditional, "handicraft"-type of skill like celestial with computers highly hilarious.

Your perception has validity, but in reality the trigonometry involved is significant. So even the most studious navigators will almost always use a calculator (slide rules till about 1975).

The alternative of course is to bypass the maths altogether and just use sight reduction tables, which I have always thought of as cheating. This is the method most people will have learnt since the second world war.

So for myself, whether using a spreadsheet or tables, they both have the equivalent cheat factor and hilarity.

StoneCrab 23-01-2021 14:24

Re: Almanac and Celestial Navigation Calculator
 
Quote:

Originally Posted by gerson (Post 3326515)
Wonderful but i use:
https://stellarium-web.org/
stellarium.org
and there is a lot of almanacs in the market
why your is better?

Gerson, your comment is rather negative.

I appreciate the stellarium link but don't understand why you would be dismissive of anyone's efforts to share their work with us.

I doubt that there are many on CF that could put together any type of nav program, so lets support his efforts. This is exceptional!

Apollo366 23-01-2021 15:11

Re: Almanac and Celestial Navigation Calculator
 
I too applaud Sean's efforts, very good job and should be very user friendly too.

In the 70's & 80's I used sight reduction tables, Pub 249 version, and other table to arrive at Noon position or LOP, and twice stars. Took too much time away from sailing the boat AFAIC.

Will love to try out nest sunny day here.

Wayne

MIRELOS 23-01-2021 15:14

Re: Almanac and Celestial Navigation Calculator
 
amazing work and a great idea

StoneCrab 23-01-2021 15:20

Re: Almanac and Celestial Navigation Calculator
 
Is it even possible anymore to purchase a current Nautical Almanac?

I tried last year and couldn't find anyone selling them. I called the local planetarium for a referral and they told me that the pro's just use a computer program.

I think this spreadsheet will be a useful tool.

Orion Jim 23-01-2021 15:26

Re: Almanac and Celestial Navigation Calculator
 
Quote:

Originally Posted by StoneCrab (Post 3326764)
Is it even possible anymore to purchase a current Nautical Almanac?

I tried last year and couldn't find anyone selling them. I called the local planetarium for a referral and they told me that the pro's just use a computer program.

I think this spreadsheet will be a useful tool.

One of many sources https://www.landfallnavigation.com/n...anac-3695.html

Apollo366 23-01-2021 15:37

Re: Almanac and Celestial Navigation Calculator
 
Hi Sean, I just tried using the Great Circle calculator and you don't have Hiva Oa or Nuka Hiva, Fr Polynesia in the data base.
As these are the two most common destinations leaving Balboa, Panama for the So Pacific, can you include them or show me how to add them please?

I haven't looked, but are all the other common Coconut Milk Run destinations included?

Many thanks,
Wayne

Apollo366 23-01-2021 15:45

Re: Almanac and Celestial Navigation Calculator
 
Quote:

Originally Posted by StoneCrab (Post 3326764)
Is it even possible anymore to purchase a current Nautical Almanac?

I tried last year and couldn't find anyone selling them. I called the local planetarium for a referral and they told me that the pro's just use a computer program.

I think this spreadsheet will be a useful tool.

You might also look for a Perpetual or 5 yr Almanac at nautical book stores, mine is on the boat in St. Croix so I can't give you any other info just now.

Besides Nautical Bookstores are totally awesome place to visit & browse!

Wayne
Still Landlocked..

StoneCrab 23-01-2021 15:45

Re: Almanac and Celestial Navigation Calculator
 
Quote:

Originally Posted by Orion Jim (Post 3326770)

Thanks Jim.

surazo 23-01-2021 16:14

Re: Almanac and Celestial Navigation Calculator
 
thank SeanPatrick .Huge effort .We will wait the new version .Thanks

hzcruiser 23-01-2021 18:17

Re: Almanac and Celestial Navigation Calculator
 
3 Attachment(s)
Great job, Sean! One can tell how much time and sweat went into it!



I tried the beta 0.24 it with "Numbers" and "Open Office" on a Mac M1. Numbers could open it and seems to work, OO crashes on every attempt.



Attachment 231031

Attachment 231032

Attachment 231033

Midnight Son 23-01-2021 18:27

Re: Almanac and Celestial Navigation Calculator
 
Downloaded and opened with libre office. No problem. I will subscribe to the thread for updates.:thumb:

Best wishes all

Invictus69 23-01-2021 19:16

Re: Almanac and Celestial Navigation Calculator
 
Quote:

Originally Posted by SeanPatrick (Post 3326344)
All,



Anyway, please try it out and let me know what you think. Thanks!


Regards,
Sean




Thanks for sharing - great job and I hope all will appreciate!
Until some years ago I have been occasionally using Starpath Perpetual Almanac (www.starpath.com), mostly for double checking the GPS chartplotter :)

Curious if someone can share experiences or comparison between the two.
:thumb:


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