We took another look through our archive and found this teaching resource, in which students use their own microscope images and compare them visually with structures in the macroscopic world while exploring the relationship between structure and function.🔬🎨
👉 scienceinschool.org/article/2023...
Mondsichel, Sekundärlicht, Plejadensterne
Mondsichel, Sekundärlicht, Plejadensterne, Satelliten
🔭 The moon and pleyades. 19.04.2026 10:40UTC, Germany. The moons secondary light is visible. One of the images also contains 2 satellites shown as trails.
🤩
Transformer les médias, une urgence démocratique !
À l’occasion de ses 30 ans, l’association Acrimed publie un Appel, en écho à l’«Appel pour une action démocratique sur le terrain des médias» de 1996.
Avec de la salade, moins de risques de brûlures 😉🩹
My paper sundial can't match the elegance of this brass capuchin #sundial, with the profile of a monk with a pointy hood ; the hour lines are contained inside his hood. Dated 1620. 10cm x 6.6cm.
🔭
I've composited (badly) a margarita, showing a pale yellow frozen drink in a shallow glass rimmed with white rock salt. Next to that is a yellow waxy substance in a plastic tub with a metal knife coated in it.
What does a MARGARITA have in common with MARGARINE?
PEARLS!
Let's take a weird dive into linguistic & chemical history!
It starts with Greek 'Margaritēs' (μαργαρίτης) which means "pearl," likely from Iranian "marvarit" via trade in jewelry from Persia.
Pour soutenir la lutte dessinée, engagée et indépendante : ▶️ https://ko-fi.com/allanbarte ▶️ https://fr.tipeee.com/allan-barte
Prends garde à toi, la finance…
François Hollande se prépare pour 2027 !
Pour soutenir la lutte dessinée, engagée et indépendante :
▶️ ko-fi.com/allanbarte
▶️ fr.tipeee.com/allan-barte
Really interesting open-access article on a heavily annotated copy of the 1515 edition of Ptolemy's Almagest from Vienna's national library, and its implications for post-Copernican uses & interpretations of ancient astronomical texts: royalsocietypublishing.org/rsnr/article... #HistAstro #HistSTM
Hand drawn colorful image of a comet's tail risong behind green hills among depicted constelltions. From Wilhelm Schickard's "Cometen-Beschreibung" manuscript of 1619 Württembergische Landesbibliothek Stuttgart, Cod.math.qt.43 http://digital.wlb-stuttgart.de/purl/bsz307044173
Journal of Astronomical History and Heritage, 29(1),101–116 (2026). THE MISUNDERSTOOD COMET: THE CURIOUS HISTORY OF COMET C/1618 V1 M. Meyer and G. W. Kronk, Abstract: Among the three comets that appeared in rapid succession between August 1618 and January 1619, comet C/1618 V1 stands out as a particularly intriguing object. Its appearance was overshadowed by the very bright comet C/1618 W1, which emerged soon after C/1618 V1's discovery. As a result, relatively few observations of C/1618 V1 were published, with a few of them even attributed to C/1618 W1, which was a much brighter comet. The confusion was further compounded by the concurrent use of both the Julian and Gregorian calendars. Due to the scarce observational material, it took until 1985 for a rough orbit to be published. Here we critically assess the available observations and show that the comet was moving in a decidedly different orbit than indicated in 1985. Based mainly on observations by Jesuits carried out from India we show that the comet is a member of the Kreutz group of sungrazing comets.
May I introduce: C/1618 V1, the latest entry for the Kreutz group of sungrazing comets! Our latest paper details the overlooked observational history of this comet and our new orbit unambiguously shows it to be a "headless wonder" Kreutz comet.
www.sciengine.com/JAHH/doi/10.... ☄️🔭 #histastro
C/2025 R3 📸 Michael Jaeger, Gerald Rhemann April 18, 2026 AZM Martinsberg Austria
Comet C/2025 R3
📸 Michael Jaeger, Gerald Rhemann
April 18, 2026
AZM Martinsberg Austria
This is the last image taken before perihelion, captured in Austria using an 8-inch RASA telescope and a color CMOS camera (10 exposures of 2 minutes each)
spaceweathergallery2.com/indiv_upload...
Vous êtes profs ?
Commandez l'offre de test ici www.casio-education.fr/offre-de-tes...
See Explanation. Clicking on the picture will download the highest resolution version available.
🔭 PanSTARRS and Planets
Image Credit & Copyright: Luc Perrot (TWAN)
ap260418
Magnifiques figures avec une bobine de Tesla
J'aime beaucoup ce mois d'avril, qui jadis m'a vu naître :-)
youtube.com/shorts/bbbeU...
Engraved plate from a 18th century book, showing on the left the detailed drawing of an armillary sphere, with many points labeled, on the upper right the drawing of a circular horizontal sundial, and on the lower right the drawing of a circular vertical sundial. Both sundials are surrounded by a sphere with circles (meridians) much like the armillary sphere, to explain the hour lines from the sphere.
Explaining the hour lines of the horizontal and the vertical #sundial (on the right) by comparing to the circles of the armillary sphere (drawn on the left).
By James Ferguson in 'Lectures on select subjects' (1775), chapter 'Dialling'.
🔭 #histsci #astrohistory
🗓️ #Éphémérides
Dimanche 19 avril en soirée
🧭 Horizon ouest – nord-ouest bien dégagé.
Observez un joli rapprochement entre un fin croissant de Lune 🌙 et l'amas ouvert des Pléiades ✨. (Vénus et Uranus seront aussi présentes quelques degrés plus au sud).
Images générées via #Stellarium 🔭
Ce n’est pas dans le thème de cet atelier, mais ce parc abrite les deux seuls cadrans solaires de la ville, l’un sur le colombier (en arrière-plan), l’autre dans le jardin des plantes vivaces. Ils datent respectivement de 1631 et 2008.☀️
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Like most sundials, this one works for a given latitude.
On my website you can find the printout with integer latitudes (41 to 52°N), and a user guide in french.
2/2
www.astrolabe-science.fr/cadran-solai...
Design of a sundial on a white paper. Vertical hour lines, 2 arc scales, tilted calendar scale, and a plot of the equation of time.
Hand holding the paper sundial, with a thread hanging from the calendar.
🔭 🧪 #EduSky
New version of my 'Capuchin' paper #sundial
More detailed calendar, declination scale, meridian elevation scale.
This altitude sundial dates from the 16th c.
Can be printed on book-sized paper and slipped in a book. Add a weighted thread with a bead.
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Félicitations à notre collègue Clotilde Laigle, pour cette distinction ! @sorbonne-universite.fr @cnrs-insu.bsky.social @cnrs-paris.bsky.social www.insu.cnrs.fr/fr/cnrsinfo/...
et pour la dernière, j'hésite encore un peu entre "L’Homme a toujours été carnivore" ou "La Terre est plate".
Je cherche des profils scientifiques, sociologues, psycho de la désinformation, journalistes enquêtes, bref, vraiment de tout. Si vous connaissez des chercheuses sur ces questions,
Pour cet été, je prépare une série de 10 émissions d'une heure sur les "rumeurs qui ont changé le monde". On va prendre des rumeurs, fausses info voire carrément des théories du complot, qu'on va détricoter. Je suis trop contente, MAIS je galère et j'ai besoin de votre aide pour trouver des FEMMES
Jesuit, mathematician, astronomer, physicist, Giovanni Battista Riccioli, author of the monumental Almagestum Novum (1651), was born 17 April 1598 #histsci
thonyc.wordpress.com/2024/07/10/a...
Oui, pareil. Ça m’a beaucoup étonné, la première fois, de pouvoir visualiser sur une photo l’équateur céleste.
From our archive. Use light to find hidden information in paintings. For ages 11 to 16. Issue 72.
Reveal different layers of your artwork! 🎨
Perfectly fitting the topic of our last issue – light – we found in our archive a hands-on classroom activity where students use UV and IR radiation, along with colour filters, to investigate their own paintings.
scienceinschool.org/article/2025...
L'un après l'autre les comptes de Hammam se font flinguer presque instantanément par Bluesky, l'empêchant d'appeler à l'aide alors que son petit frère, sa mère et lui-même s'enfoncent dans la faim, la maladie et le désespoir. Merci d'alimenter leur cagnotte, même les plus petits dons sont décisifs.
scatter plot on a light blue background, showing as orange dots the positions of the Sun toward south, at different labeled dates, at the same hour. The curve is shaped as an 8.
polar diagram with positions of the 4 rocky planets around the Sun, over the course of several months in 2026, every 10 days. Blue background.
polar diagram with positions of gaseous planets around the Sun, over the course of 10 years, every 2 years. Blue background.
Trying my hand at the #astropy #Python package for #astronomy with some *very* basic scripts.
Just learning to retrieve altaz and heliocentric coordinates, so far.
Scripts available on my website:
www.astrolabe-science.fr/graphiques-a...
An image of a stick figure on the road to Paris carrying a huge uni-ball eye micro pen. He is followed by a black cat. This Saturday, 18th April 2-4pm I will be signing and doodling in my books at Librairie l'Atelier 2 bis rue du jourdain, Paris, 75020
I'll be in Paris on Saturday!
Come along and get a book signed!
librest.com/librairies/lib…
editions2042.com
Vous êtes-vous levés ce matin (très tôt) en vous demandant, comme Guillaume Erner d'@franceculture.fr, s'il fallait revoir notre modèle d'Univers ? Heureusement, Silvia Galli d'@iap.fr, interviewée par @alexandradelbot.bsky.social, était là pour lui répondre : www.radiofrance.fr/francecultur...
