Home made calibration #lab.

Let's see how accurate this 58 year old neglected #sextant is.

#sailing #sailboat #navigation #celestialnavigation

So much emotion...
So much possibility...
#sailing #navigation #sextant #NavalHistory #oldschool
Did a workshop on celestial navigation today. Used a sextant from Freiberg, as old AS me. #navigation #sextant

I decided I should really put the #celestial #navigation course I took a few years ago into practice, so started looking online for a second hand #sextant.
One eBay ad looked promising, I got all keen, but when I asked for some more photos (as I thought I could make out some corrosion - actual furriness on a polished aluminium part) it was taken down. A narrow escape on my part, the search continues.

Hey Mastodon, I don’t suppose anyone’s got a decent sextant for sale?

@rachel

So that is the story of how I happened to acquire a modern #sextant for only $12.

When I came home and could browse the Internet (this was long before I had data access on my phone), I discovered that yes, it was missing a tube or scope at the eyepiece section, but was otherwise complete.

I have been either busy or ill since acquiring it but do fully intend and expect to play around with it one of these days.

But I still laugh at myself for my brain being so misled by the sextant's material (dark plastic) and my general unfamiliarity with the devices (on the #landlocked #prairies ).

Clearly the charity store didn't recognise it either, or I'm sure it wouldn't have been casually tossed among miscellanea for $5, but behind glass at a rather higher price. 😂

Best of luck to you on your quest to borrow a sextant! 🙂❤️

8/fin

@rachel

I decided to buy it. It was less than $5 #Canadian so not a big deal for an impulse purchase.

A few minutes later I came across the #sextant's box, complete with a carved-#foam interior, so old that the foam was starting to crumble to dust.

The box was priced separately, at something like $12.

When I went to the cashier, I showed that the two items clearly belonged together and could I get a discount on them as a single item? The manager let me have both for the price of the box.

7/x

@rachel

Again, I live nowhere near a sea or ocean. I've never seen an actual #sextant in real life, just ones in movies or illustrations.

And those sextants were always shiny #brass, not #plastic!

But now that I understood the object's purpose, I also realised that #plastic was an excellent #medium for using in a #boat or #ship: it won't rust or corrode from #water or #salt.

6/x

@rachel

A pendulum! This jogs my brain to an apparently-random #memory, likely from #JamesBurke's #TheDayTheUniverseChanged series, about how #latitude was easy to determine via the skies, but that #longitude could not be measured until timepieces that did NOT require a #pendulum to drive it were invented.

Pendulum movement isn't very functional on a rolling #ship, after all.

And at that moment, the name of the item
I held and it's purpose snapped vividly to mind: it was a #sextant!

5/x

@rachel

Alas distance makes it impossible for me to help you, but hilariously I -- someone in the middle of the #Canadian #prairies with zero access to sea or ocean, DO happen to have a #sextant.

The story of this is amusing (IMO) so please bear with me while I share. 🙂

So one day I'm at a chain #charity #secondhand goods store (#ValueVillage, in particular) and I find this weird triangular-ish item randomly among the less-categorised items.

At first I assume it is a toy: I don't keep up with modern kids' #TV or #film franchises but it looks like the sort of weird item that might get designed as some sort of #alien #weapon, especially as it was made of very dark plastic.

1/x