Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 30-08-2020, 21:13   #1
Registered User

Join Date: Aug 2019
Location: Western Arkansas
Boat: catalina 22 & 27
Posts: 166
NASA develops new type sextant

I have been researching sextant and celestial navigation. I am buying some equipment and books to learn the basics.

So I'm searching and come across this interesting article. I can make one myself!

https://spacecenter.org/try-this-at-...ild-a-sextant/

Thx-Ace
Attached Thumbnails
Click image for larger version

Name:	Homemade-sextant.png
Views:	357
Size:	69.9 KB
ID:	222349  
__________________
Peace Sells, Who's Buying?
acem is offline   Reply With Quote
Old 30-08-2020, 21:25   #2
Registered User
 
SeanPatrick's Avatar

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 245
Re: NASA develops new type sextant

There's also this one you can make from a CD case and some LEGOs®:


https://www.tecepe.com.br/nav/CDSextantProject.htm







______________________________________________
So far, so good ... so what?
SeanPatrick is offline   Reply With Quote
Old 30-08-2020, 21:57   #3
Registered User

Join Date: Feb 2018
Posts: 1,184
Re: NASA develops new type sextant

Quote:
Originally Posted by acem View Post
I have been researching sextant and celestial navigation. I am buying some equipment and books to learn the basics.
If really bored, consider reading into ancient astronomy, back to the Babylonian era. Certainly they created devices to measure things down to a degree or so, and otherwise mapped out lunar cycles and certain planetary cycles to a high degree (some of it maybe encrypted in the Old Testament).
https://www.scientificamerican.com/a...ablet-reveals/
And a book printed on unobtanium:
https://www.amazon.com/Mathematical-.../dp/354006995X
Singularity is online now   Reply With Quote
Old 30-08-2020, 22:02   #4
Registered User
 
SeanPatrick's Avatar

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 245
Re: NASA develops new type sextant

Quote:
Originally Posted by Singularity View Post

$3200!!


I paid less for my 1781 printing of the Tables Requisite ... and that's actual history!
SeanPatrick is offline   Reply With Quote
Old 30-08-2020, 22:09   #5
Registered User

Join Date: Oct 2014
Posts: 3,848
Re: NASA develops new type sextant

Been around for years.
Attached Thumbnails
Click image for larger version

Name:	SEXTANT BAR & GRILL.jpg
Views:	306
Size:	127.1 KB
ID:	222350  
Montanan is offline   Reply With Quote
Old 31-08-2020, 09:12   #6
Registered User

Join Date: Jul 2014
Location: Dieren Holland
Boat: Atlantic 43
Posts: 22
Re: NASA develops new type sextant

Look for an Astrolabe, it's much better
Riddle is offline   Reply With Quote
Old 31-08-2020, 10:55   #7
Registered User

Join Date: May 2011
Boat: Hitchhiker, Catamaran, 40'
Posts: 1,082
Re: NASA develops new type sextant

I knew a guy who sailed from San Diego to Hawaii on an Aquarius 23 using nothing but a protractor like the one shown and a National Geographic map as a chart. He also used an AM radio as direction finder when he got close enough. He wasn't trying to break a record or prove a point. He basically didn't know any better. He had no gps. He did have a compass. His mainsail was from a Hobie cat. His 2 way radio was a CB. He used the north star as his reference. He left Kauai bound for Alaska several months later and was never seen again. Sad story but true.
Thumbs Up is online now   Reply With Quote
Old 31-08-2020, 11:05   #8
Registered User

Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 12,348
Re: NASA develops new type sextant

Also see David Burch's "Emergency Navigation" for some similar/related ideas...


https://www.amazon.com/Emergency-Nav.../dp/0877422605
belizesailor is offline   Reply With Quote
Old 31-08-2020, 12:40   #9
Registered User

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 20,309
Re: NASA develops new type sextant

If you are happy with give or take 1000 miles accuracy.


Otherwise invest in YRVINDS SEXTANT (or build one).


b.
barnakiel is offline   Reply With Quote
Old 31-08-2020, 13:01   #10
Moderator
 
Adelie's Avatar

Join Date: Feb 2010
Location: La Ciudad de la Misión Didacus de Alcalá en Alta California, Virreinato de Nueva España
Boat: Cal 20
Posts: 11,873
Re: NASA develops new type sextant

Given an accurate watch and nothing else you can establish your position within 20nm. Plenty to hit a Hawai'i landfall.
__________________
Num Me Vexo?
A house is but a boat so poorly built and so firmly run aground no one would think to try and refloat it.
Adelie is online now   Reply With Quote
Old 31-08-2020, 17:25   #11
Registered User

Join Date: Aug 2019
Location: Western Arkansas
Boat: catalina 22 & 27
Posts: 166
Re: NASA develops new type sextant

Its interesting the things you can do if ya just put out the effort.

I have read stories of people sailing from California to Hawaii and back without any navigational instruments. They follow the contrails in the sky to Hawaii. Back to California, they just go east until you find land.

Back in the 70s my father in law and his teenage son put a rowboat in the Mississippi in northern Missouri. They floated down until they found New Orleans. They found a payphone and called home for someone to come get them!

I'm not quite that seat of my pants but to each their own.

Thx-Ace
__________________
Peace Sells, Who's Buying?
acem is offline   Reply With Quote
Old 31-08-2020, 17:29   #12
Registered User

Join Date: Apr 2019
Posts: 968
Re: NASA develops new type sextant

look up Marvin Creamer - he went round the world (successfully, around 1984) with NO navigation instruments - no clock, no compass, nothing but his eyes and brain.
Breaking Waves is offline   Reply With Quote
Old 31-08-2020, 18:47   #13
Moderator
 
Adelie's Avatar

Join Date: Feb 2010
Location: La Ciudad de la Misión Didacus de Alcalá en Alta California, Virreinato de Nueva España
Boat: Cal 20
Posts: 11,873
Re: NASA develops new type sextant

Quote:
Originally Posted by Breaking Waves View Post
look up Marvin Creamer - he went round the world (successfully, around 1984) with NO navigation instruments - no clock, no compass, nothing but his eyes and brain.
He was in his 60's, had a very good memory, knew a lot of geography and knew a lot of way-finding lore.

Instruments are what the rest of us use to make up for mediocre memory, lack of time to learn the geography and lore.

This is not to knock his accomplishments, they were astounding, as much as Polynesian navigators.

If anybody is interested in the lore, Harold Gatty (Navigator for Willy Post when he went RTW) wrote a book with plenty of sea lore and the previously mentioned Celestial method that only used a watch. Name of the book was "The Liferaft Book". Book was produced during WWII specifically to go into liferafts, hence the title.
__________________
Num Me Vexo?
A house is but a boat so poorly built and so firmly run aground no one would think to try and refloat it.
Adelie is online now   Reply With Quote
Old 31-08-2020, 19:18   #14
Registered User

Join Date: Feb 2018
Posts: 1,184
Re: NASA develops new type sextant

Quote:
Originally Posted by Adelie View Post
He was in his 60's, had a very good memory, knew a lot of geography and knew a lot of way-finding lore.

Instruments are what the rest of us use to make up for mediocre memory, lack of time to learn the geography and lore...
-Tinfoil hat trigger warning-
Some very interesting research has been done over the years on peoples' innate sense (or not) of direction based on magnetic fields (not to mention other topographic mental faculties of varying ability).

For some context, dogs have been found to predominantly relieve themselves facing N/S when ambient magnetic fields are stable, while at least certain birds navigate using principles of quantum entanglement.

One older study in humans (?1980s in UK) found that people could be blindfolded, driven about, and have a >50% chance of pointing towards home (or somesuch). More recently folks were placed in a Faraday cage whereupon fields were introduced to replicate Earth's fields, wherein EEG/brainwave changes were reliable induced.

What all this (and other) research suggests is that some of people will excel in navigation for reasons they will never understand. Not just, per se, that they're good with a compass and ruler and sextant, but their 'spidey sense' intuition plays a more dominant roll than they recognize...behind the scenes guiding the whole operation.

All this otherwise lends credibility that some people likely are genuinely more sensitive to EM radiation, jokes withstanding.
Singularity is online now   Reply With Quote
Old 31-08-2020, 22:54   #15
Registered User
 
SeanPatrick's Avatar

Join Date: Dec 2012
Location: Norfolk, VA USA
Posts: 245
Re: NASA develops new type sextant

Quote:
Originally Posted by Singularity View Post
[...] some of people will excel in navigation for reasons they will never understand. Not just, per se, that they're good with a compass and ruler and sextant, but their 'spidey sense' intuition plays a more dominant roll than they recognize...behind the scenes guiding the whole operation.

I'm not that person. My sense of direction is terrible. I need GPS in my life.


I'm okay with a sextant and pretty good with a ruler. But maybe that's why I'm so interested in navigation to begin with ... I know I'll get lost.
SeanPatrick is offline   Reply With Quote
Reply

Tags
asa, sextant

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
raymarine type 2s linear drive with type 100 course computer tchiffriller Electrical: Batteries, Generators & Solar 4 11-09-2020 09:57
Best. Type I and Type II MSD csh Plumbing Systems and Fixtures 4 22-12-2014 17:44
Kid develops means of removing plastic from oceans... itchybro Cruising News & Events 7 02-04-2013 03:45
Nasa Clipper NMEA Pin Connector Info? Nimrod Marine Electronics 2 07-07-2009 04:29
NASA Radar Unit Problem Sailor24 Marine Electronics 6 01-09-2008 04:06

Advertise Here


All times are GMT -7. The time now is 11:27.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.