constructing an Astrolabe?

Post by Nikolai Petrovich
Greetings and Salutations
I have a very nice cardboard astrolabe, but it is calculated for
40 degree's north. which is about 550 miles south of where I am.
Does anyone have a reference for how one goes about calculating /
constructing one of a particular latitude?

I just googled "astrolabe calibration" and got many sites. I
glanced at a few and realized I don't have the math for this.
But then, I don't have the math for high-school algebra any more.
This is a very low bar.

I suggest you also google "astrolabe calibration" and search
through the sites, and _Deo volente,_ you'll find what you need.
Good luck.

--
Dorothea of Caer-Myrddin Dorothy J. Heydt
Vinhold/Mists/West Vallejo, California
PRO DEO ET REGE djheydt at gmail dot com
www.kithrup.com/~djheydt/

Nikolai Petrovich

2018-12-01 19:14:54 UTC

I just googled "astrolabe calibration" and got many sites. I
glanced at a few and realized I don't have the math for this.
But then, I don't have the math for high-school algebra any more.
This is a very low bar.
I suggest you also google "astrolabe calibration" and search
through the sites, and _Deo volente,_ you'll find what you need.
Good luck.

That is the next step.

Or find my copy of Geoffrey Chaucer's Treatise on the Astrolabe.

tschus
nikolai

Dorothy J Heydt

2018-12-01 20:27:14 UTC

I just googled "astrolabe calibration" and got many sites. I
glanced at a few and realized I don't have the math for this.
But then, I don't have the math for high-school algebra any more.
This is a very low bar.
I suggest you also google "astrolabe calibration" and search
through the sites, and _Deo volente,_ you'll find what you need.
Good luck.

That is the next step.
Or find my copy of Geoffrey Chaucer's Treatise on the Astrolabe.

Well, my copy of that is with my Collected Works of, and it's in
Middle English. :) And it'll be either (a) calculated for a
London or thereabouts latitude, or (b) doesn't mention the
latitude of the observer at all. But the Internet can be your
friend.

--
Dorothea of Caer-Myrddin Dorothy J. Heydt
Vinhold/Mists/West Vallejo, California
PRO DEO ET REGE djheydt at gmail dot com
www.kithrup.com/~djheydt/

Nikolai Petrovich

2018-12-02 01:19:11 UTC

I just googled "astrolabe calibration" and got many sites. I
glanced at a few and realized I don't have the math for this.
But then, I don't have the math for high-school algebra any more.
This is a very low bar.
I suggest you also google "astrolabe calibration" and search
through the sites, and _Deo volente,_ you'll find what you need.
Good luck.

That is the next step.
Or find my copy of Geoffrey Chaucer's Treatise on the Astrolabe.

And sometimes, it can be that friend who has all sorts of answers,
some of which are relevant to your question.

But' I've found a translation into modern English, and an article
about using Power Point to make the templates. Which has the
formulas. Weeeee!

tschus
Nicolai

Dorothy J Heydt

2018-12-02 02:30:52 UTC

I just googled "astrolabe calibration" and got many sites. I
glanced at a few and realized I don't have the math for this.
But then, I don't have the math for high-school algebra any more.
This is a very low bar.
I suggest you also google "astrolabe calibration" and search
through the sites, and _Deo volente,_ you'll find what you need.
Good luck.

That is the next step.
Or find my copy of Geoffrey Chaucer's Treatise on the Astrolabe.

And sometimes, it can be that friend who has all sorts of answers,
some of which are relevant to your question.
But' I've found a translation into modern English, and an article
about using Power Point to make the templates. Which has the
formulas. Weeeee!

Bravo!

--
Dorothea of Caer-Myrddin Dorothy J. Heydt
Vinhold/Mists/West Vallejo, California
PRO DEO ET REGE djheydt at gmail dot com
www.kithrup.com/~djheydt/

Basil D

2018-12-02 23:04:00 UTC

I just googled "astrolabe calibration" and got many sites. I
glanced at a few and realized I don't have the math for this.
But then, I don't have the math for high-school algebra any more.
This is a very low bar.
I suggest you also google "astrolabe calibration" and search
through the sites, and _Deo volente,_ you'll find what you need.
Good luck.

That is the next step.
Or find my copy of Geoffrey Chaucer's Treatise on the Astrolabe.
tschus
nikolai

Or go the the source, Theon of Alexandria---oh wait, his work hasn't survived. You'll have
to make do with John Philoponus. ;-)

~~Basil

Basil D

2018-12-02 23:15:29 UTC

Post by Nikolai Petrovich
Greetings and Salutations
I have a very nice cardboard astrolabe, but it is calculated for
40 degree's north. which is about 550 miles south of where I am.

I can sympathize. I have a nice planisphere; turn the upper circle so the time matches the
date on the lower circle, and look at the clear part to see what should be in the sky.

It's set for 30 degrees north, which is about 17.5 degrees from me.

30 degrees north, and it was made in the USA--sheesh, how un-useful can you get? :-/

Post by Nikolai Petrovich
Does anyone have a reference for how one goes about calculating /
constructing one of a particular latitude?
in service
Nikolai Petrovich

Nikolai Petrovich

2018-12-05 15:21:43 UTC

I am having "fun" crunching all this. I shall be writing up my
notes when I'm done, but I'm not sure how to show the required
drawings in ASCII art. B-{)>

Dorothy J Heydt

2018-12-05 15:53:00 UTC

I am having "fun" crunching all this. I shall be writing up my
notes when I'm done, but I'm not sure how to show the required
drawings in ASCII art. B-{)>

If you have an account on any site that does have graphics, you
could post a link.

--
Dorothea of Caer-Myrddin Dorothy J. Heydt
Vinhold/Mists/West Vallejo, California
PRO DEO ET REGE djheydt at gmail dot com
www.kithrup.com/~djheydt/

Nikolai Petrovich

2018-12-06 04:03:08 UTC