Bluesky Feed - History of Astronomy

The Astrosky Ecosystem @astrosky.eco · about 1 year ago

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David ALBERTO @astrolabe-science.fr · 3 days ago

🔭 🧪 #astrohistory A paper nocturnal by Samuel Foster, for finding the time of southing of stars (crossing the meridian). With 20 stars. Also finding the meridian altitude of stars, and their rising/setting times. Book written by J. Twysden, who collected Foster's papers after his death in 1652.

screenshot from an old book: a circular diagram with a scale on the edge (zodiac calendar) a small hour disc, and an index.

Title page from Twysden's 1685 book 'The Description and Use of the NOCTURNAL ; by Mr Samuel Foster".

printout of the instrument, ready to be assembled into a paper astronomical instrument.

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David ALBERTO @astrolabe-science.fr · 5 days ago

"Planisphère mobile" par Mlle Ginot d'Esroys (1847). A sky chart. Credit: Gallica/BNF. 🔭 #historyofastronomy

Circular paper with moveable parts, labeled stars & constellations, in french. Red rim. red library stamp.

Closer view of the title "Planisphère mobile au moyen du quel on peut apprendre l'astronomie seul et sans le secours des mathématiques / Imité de l'anglais par Mlle Ginot d'Esroys" . Library stamp: "Bibliothèque Impériale Géogr."

Close view on some stars near the pivot and the Milky Way.

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David ALBERTO @astrolabe-science.fr · about 2 months ago

🔭 #astrohistory

Suzanne Karr Schmidt @drkarrschmidt.bsky.social

Sundial Sunday! (Featuring historical collection items from the MIT Museum.)

A bunch of sundials in a case that looks like a banana.

Diptych hand drawn dial with a rabbit on it.

Multi-lobed brass dial, folding components.

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David ALBERTO @astrolabe-science.fr · 3 months ago

Brass nocturnal with a horizontal sundial ~1734 A Hadley octant, brass & ebony, ~1775 A sextant, brass & ebony, ~1780 The Museum is set inside the 17th citadel of Port-Louis, Britanny. #astrohistory #histsci 2/2

app.bsky.embed.gallery#view

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David ALBERTO @astrolabe-science.fr · 3 months ago

I saw a copy last year in Paris, opened at the page of this lovely Moon volvelle. I could't figure out exactly how it was drawn and used... 🔭 #astrohistory

page from an old book, with a circular diagram made of 3 circles with round scales, and the letters L U N E at the corners. Decorated with sun and moon faces at the center.

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David ALBERTO @astrolabe-science.fr · 3 months ago

🔭 🧪 #EduSky #astrohistory Don't mind me, I'm just dreaming I was one of Delure's wealthy clients in Paris, commissioning this lovely double #sundial in the early 18th c... 1/5🧵

Brass sundial with 2 sets of hour lines, one on an octogon plate, one on an oval. A thin triangle stands above the plates, richly decorated. A civil and a zodiacal calendars are inside the oval plate. On a black stand. Credit: M. Delalande.

Sundial upside down, with the maker's signature: Delure Paris.

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David ALBERTO @astrolabe-science.fr · 3 months ago

#histsci #astrohistory

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David ALBERTO @astrolabe-science.fr · 3 months ago

So Beautiful! 🔭 #astrohistory

Stephen Johnston @stephenaj.bsky.social

Just published online: a blog post with the first findings from my January research trip to Jacksonville, Florida. This is the unexpected location of a remarkable "new" astronomical compendium by the 16th-century London maker Humfrey Cole. More to follow.... scientificinstrumentsociety.org/blog/

A cotton-gloved hand holds a silver circular disc, itself part of a larger astronomical compendium. The volvelle disc carries an engraved zodiac-calendar scale and two independently rotating discs, one with a sun pointer underneath a smaller disc with a moon pointer. The centre of the moon disc has an astrological aspectarium and a window to show the phase of the moon. Beyond a hinge, a part of another circular face of the instrument is visible.

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processingthesky @processingthesky.bsky.social · 4 months ago

What was the Horsehead called before it was a horse? Short excerpt from Episode 2 of Processing the Sky. Full episode: youtu.be/lK27Uhc7-Mw #astrophotography #astronomy #astrohistory #space #science #deepsky

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