uxor boosted
uxor boosted

#Unix #Shell #Question: does anyone make extensive use of #pushd and #popd? I tend only to use it if I’m repeatedly swapping between a couple of #directories but I’m pretty sure that it’s much more powerful than just that.

Belle soirée d'observation vendredi
Les nébuleuse planétaires M57, M27 avec 1 étoile en surimpression, NGC 6905 coincée entre 2 étoiles
Des amas ouverts comme M71 et globulaires M2 et M15 avec sa forte condensation centrale
Des galaxies NGC 891 faible vue seulement après désembuage, M33 structure spirale très difficile et NGC 404 petite collée à l'étoile double almach Andromède (comme albiréo en plus serrée)
Pour finir NGC 6960 le dentelles du Cygne 🤩 Jupiter/saturne malgré la turbulence

Show thread

collimation is essential for telescope. The laser help to adjust primary and secondary mirrors position.

uxor boosted

#mathgenerator is a #math problem generator.

mathgenerator is a #Python #library that generates problems for practicing #maths. Many different generators are available, ranging from arithmetic to calculus, statistics, and basic maths of computer science. mathgenerator has a companion library worksheetgen for generating complete PDF worksheets of problems.

Website 🔗️: lukew3.com/mathgenerator

#free #opensource #foss #fossmendations #programming #mathematics

@edasfr ce qui est dit dans ce billet s'applique aussi en grande parti au secteur public, le capital y est remplacé par l'appartenance de chaque fonctionnaire à un "corps" dont certains représente un véritable capital (et pas les autres) ...

@evilscientistca it is still a problem in astrophysics but blue stragglers are probably formed when 2 old stars merge to give a new star which is heavier and then appear blue unless it is not a young giant star. In a globular cluster the merge of 2 stars should happend more frequently than elsewhere.

@evilscientistca except Blue Stragglers stars in such clusters!

uxor boosted

Globular clusters, such as M2 shown here, are balls of often hundreds of thousands of stars held together by their mutual gravitation.
Globular clusters are found orbiting galaxies, including our own Milky Way Galaxy.

uxor boosted
uxor boosted

Currently working on a new #mosaic #photo of NGC6888 in #narrowband and found this very faint bubble nebula in my O-III (oxygen emission line) data.

Strange thing is it does not appear on my H-a data.

First thought it could be an artifact from the optics, however, after some resarch this is actually a newsly (2008) discovered nebula (discovered by an amateur astronomer too!)

Quite amazed by what my telescope can pick up.

The mosaic will be 240MP when it's finished

uxor boosted

if you have clear sky tonight look at south : the most brilliant "star" you can see is and close to it on the right this is above in the sky is the summer triangle Altaïr-Deneb-Vega

uxor boosted

@Yahiko oui pendant longtemps il y avait des renard à passer la nuit pour aller voir le poulailler du voisin, mais la gale du renard les a décimé ces dernières années. Beaucoup de chauve-souris aussi , une avait même commencé à nicher derrière un volet à un moment!

@Yahiko les nuits autour de la pleine Lune y a pas mal d'animaux en vadrouille. hier soir y en avait unqui fouinait pas loin pendant que j'observais, un blaireau probablement ... les nuits sans Lune c'est les chouettes hulotes qui sont à fond!

still a nice weather to observe and , smartphone shot through the from my backyard.

uxor boosted

Someone at work sent me this algebra puzzle, which I think came from The Times newspaper:

Solve 9ˣ+15ˣ=25ˣ.

(Put a CW on solutions in replies, please!)

Have you seen it before? Did you see it in The Times?

uxor boosted

@erou tu as regardé les mooc sur la préparation à l'entrée dans le supérieur en mathématiques sur funmooc? Je les trouve bien fait, et il y a de l'échange entre apprenants et aussi avec l'équipe de suivi. Pour quelqu'un de motivé c'est pas mal.

Show more
Mastodon

The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!