The Astrolabe Project

During my vacation, I spent a few hours one afternoon with a straight-edge, a compass, and my copy of Stoeffler’s Elucidatio – The Construction and Use of the Astrolabe. I was able to draw out a basic climate plate very easily; in fact I was surprised at how straight-forward it was. I am inspired to draw an astrolabe from scratch using the techniques described in the book, and to display the result at the Arts and Sciences Display during Pennsic 41.

Project: Drafting the astrolabe with straight-edge and compass

• Using only a straight-edge, compass, and pencils, design a complete set of plans for an astrolabe.
• Create front, back, rete, rules, and a climate plate set
• Photocopy the above, assemble and laminate for testing.
• Step-by-step examples of how the climates are drawn.
• Document the whole process in this blog over the course of the year.

This project, besides being a fun challenge, will give me a more in-depth understanding of how an astrolabe works. Moreover, it will provide insight into the minds and techniques of period instrument makers, and (hopefully) provide other students a clear set of instructions for designing their own instruments.

I’m back from Pennsic War XL. Still coughing up the dust, tired and happy. So starts another 50 week town run.

My two Astrolabe classes were well attended, especially in view of the fact that one was late in the day and the other was scheduled very late in the war. If I remember correctly, there were 17 people in the first and at least 16 in the the second. As usual there was a wide range of students, including a forensic astronomer in the first and a jeweler in the second (the latter wanted to know about design and construction details, she has access to a rapid prototyper and injection molding. We may have some astrolabes for sale at the war yet…)

The updated handout worked much better, as did the simplified astrolabe. The flow of the classes was smoother, and I had to spend much less time sorting out confused students.

Based on my impressions, I’m going to be overhauling the handout once again. This time, instead of a basic and advanced section, I’m going to break it into chapters; with one or two concepts per chapter. Each chapter will build on the concepts in previous chapters, and will include multiple detailed examples for each new concept, as well as a review. I’m removing the discussion on time-keeping and prayer times to an appendix, and will just reference the information I need for the examples. This will allow me to cover the basics smoothly and to adjust the class time as needed: I can cover chapters until I run out of time, some classes are faster than others; so I cover what I can and make the handout clear enough that it allows a student to work on what we couldn’t cover.

The current version of the astrolabe is pretty solid. I’m probably going to keep it as it is.

The new, updated handout and set of astrolabe files to be used in my upcoming Pennsic War class can be found linked on the right.

My class: The Astrolabe in Theory and Practice, will be taught at the Pennsic War. I am teaching the class twice: August 7 at 5pm and August 12 at 1pm. Handouts are limited to 15 per class with a fee of $5. Auditors welcome. The handout and the astrolabe files will be posted here the week before Pennsic at the latest.

I made more changes to the generator. The azimuth lines are now optional, and I added an option to print just the sine scale on the back.

I spent the last few hours noodling around with the generator code. I fixed several bugs. I also removed, at least temporarily the 6 and 12 degree twilight lines as they were cluttering up the plate and serve no real purpose.

I had my class at Atlantia University yesterday. I tried a different arrangement for the information in the class. The flow was better, but there is still too much to cover and I find my audience’s  eyes glazing by the 1:15 mark. The class was will received in any case, and I think everyone got a good grounding in the basics. The updated handout and the zip file with the demo astrolabe files is linked to the right.

In other news I will be teaching the class again next month. I’m overhauling the handout again. I think that breaking the class up into a beginning, 1 hour, section with the bare basics, followed by a second, optional hour of advanced features will work better.

I’m working on completely overhauling and expanding my class handout. I’m looking to turn it into more of a useful pamphlet rather than the bare-bones outline it currently is. The results will show up in The Missing Manual soon.

In other news, I will be teaching my class: “The Astrolabe in Theory and Practice” at Atlantia University the first Saturday in March.

Haven’t posted in a month, but I have been working… If you go have a look at the manual, you will see several new pages. I hope to keep up a good pace the rest of the month.

I added some sections to the astrolabe manual. and was able to make good progress in developing my own art for the various diagrams. I hope to make significant progress this coming week on converting my class handout into a manual