#spherical trigonometry

Plate to represent the Unequal Hours Arcs

The plate currently shows the various arcs for almucantar and azimuth (see part four). The new section will cover the fun (but sometimes confusing) construction for the unequal hours! They form 12 segments from 11 lines radiating from the below previous sections.

This is a step-by-step guide to the complete construction of an astrolabe that I think might exist. At least, in any accessible form

As always, my goal is for this to be as accessible as possible for any kind of reader, so if there are any questions, please feel free to reach out

(2/100) days of productivity 🍃

click photos for hd: My trigonometry notes for tuesday! Unfortunately I got busy that's why I just uploaded it today.

Plate to represent the Horizon, Almucantar, and Twilight Arcs

The plate currently shows three concentric circles for the Tropic of Cancer, Tropic of Capricorn, and the equator. This next part builds off the base plate and adds more arcs and circles

The middle plate--known as the Tympan--is perhaps the most complex piece of the entire astrolabe, so this is part three of constructing the plate and only part two of specifically constructing the tympan plate

The circles on the face of the plate represent “almucantar” and twilight arcs.

This is a step-by-step guide to the complete construction of an astrolabe that I think might exist. At least, in any accessible form.

My goal is for this to be as accessible as possible for any kind of reader, so if there are any question, free free to reach out

Plate to represent the Tropics and the Equator

The construction continues into part two!

The middle plate--known as the Tympan--is perhaps the most complex piece of the entire astrolabe, so I am going to be breaking it into a few parts to make it more readable

The first part starts with just three concentric circles for the Tropic of Cancer, Tropic of Capricorn, and the Equator.

No math needed!

This is a step-by-step guide to the complete construction of an astrolabe that I think might exist. At least, in any accessible form.

My goal is for this to be as accessible as possible for any kind of reader, so if there are any question, free free to reach out

Plate to represent the Azimuth Arcs

The plate currently shows the concentric circles for the Tropics and equator as well as the arcs for the almucanter circles (see part three). This new section will cover azimuth arcs! They are the spider web looking lines in the center of the plate.

The middle plate--known as the Tympan--is perhaps the most complex piece of the entire astrolabe, so this is part four of constructing the plate and only part three of specifically constructing the tympan plate

This part is perhaps the most difficult of all the steps since uses a new kind of projection method, but it ends up being quite beautiful when the pieces are done

This is a step-by-step guide to the complete construction of an astrolabe that I think might exist. At least, in any accessible form

As always, my goal is for this to be as accessible as possible for any kind of reader, so if there are any questions, please feel free to reach out

Let’s gooooooooo! 🎉 🔭

Part One is live! Long time coming, but it is finally out. Biggest project I’ve undertaken for the History Survival Guide so far but learned a lot and I am excited to finally get a chance to share this

This is a step-by-step guide to the complete construction of an astrolabe that I think might exist. At least, in any accessible form

This work is a synthesis of dozens of papers/books, one or two out-of-print books, a book entirely in French that I had to translate each section as I read, a few emails to authors, and one long Twitter conversation with a museum curator

My goal is for this to be as accessible as possible for any kind of reader, so if there are any questions, feel free to reach out