#focus
#JohannesKeppler was a brilliant #astronomer who studied the motion of #planets. Like everyone, he also had some strange ideas about the heavens, no doubt as a person in the middle ages would about the harmony of worlds and their purported relation to things like the #PlatonicSolids, which was of course bogus. He is probably best known for his famous three laws of #PlanetaryMotion which he reluctantly formulated when he had to abandon the idea that planets only orbit the #Sun in perfect #circles.
His First Law says that planets orbit the Sun in an #ellipse with the Sun at one #focus. Of course, a circle can be thought of as an ellipse where the two #foci have coalesced into one point (zero eccentricity). Here is what the orbit would look like in that case. The angular velocity of the planet is constant in this case and the areas swept out in equal times are identical.
#Keppler's Second Law states that the areas swept out in equal times are always identical, even for eccentric ellipses. Here are two examples and you can show that the areas of all the sectors in each case are identical. The Sun is labelled S, the other focus is labelled S' and the centre of the orbit is labelled C.
The corollary of this law is that the angular velocity of the planet changes over its orbit, being faster when it is closer to the Sun and slower when it is further away. I have shown the constant-velocity position in red and you can see that it lags behind for half the orbit and leads for the other half.
These animations required me to learn the #mathematics of #CelestialMechanics and I had to find out what terms like #MeanAnomaly, #EccentricAnomaly and #TrueAnomaly are. It also requires the #NumericalSolution of one algebraic equation, which was fun to investigate. All the details are on the #Wikipedia page for Kepler's Laws here:
https://en.wikipedia.org/wiki/Kepler%27s_laws_of_planetary_motion
The third law relates the orbital period to the mean distance from the Sun but that is not covered here.
#MyWork #Maxima #WxMaxima #FreeSoftware #Physics #Astronomy #AnimatedGif #Animation
rééducation des yeux
corriger sa vue naturellement avec "active focusing"
https://www.youtube.com/watch?v=RfO0x9uIkTQ
#vue #presbytie #myopie #bates #focus #soin #alternative #naturelle
#Nsfw #CO2 #WorldClimateChange #WccReport2020 #Focus #LetteraAlleGenerazioniFuture #DirittiDelleGenerazioniFuture #Ambiente #Ecologia #CO2 #Atmosfera #AnidrideCarbonica #GasSerra #InquinamentoAtmosferico #EffettoSerra #CambiamentiClimatici #Clima #GlobalWarming #RiscaldamentoGlobale #GasInquinanti #AtmosferaTerrestre #Antropocene
#Nsfw #CO2 #WorldClimateChange #WccReport2020 #Focus #LetteraAlleGenerazioniFuture #DirittiDelleGenerazioniFuture #Ambiente #Ecologia #CO2 #Atmosfera #AnidrideCarbonica #GasSerra #InquinamentoAtmosferico #EffettoSerra #CambiamentiClimatici #Clima #GlobalWarming #RiscaldamentoGlobale #GasInquinanti #AtmosferaTerrestre #Antropocene
#Nsfw #CO2 #WorldClimateChange #WccReport2020 #Focus #LetteraAlleGenerazioniFuture #DirittiDelleGenerazioniFuture #Ambiente #Ecologia #CO2 #Atmosfera #AnidrideCarbonica #GasSerra #InquinamentoAtmosferico #EffettoSerra #CambiamentiClimatici #Clima #GlobalWarming #RiscaldamentoGlobale #GasInquinanti #AtmosferaTerrestre #Antropocene
Focus ~ 50 Jaar ~ Full Concert
https://www.youtube.com/watch?v=opon0lE3lLQ
#Focus is no less than half a century old and the #legendary #band is still alive & kicking. With a completely unique form of #progressive #rock, Focus manifested itself in the first half of the #seventies as the most #successful and most #appreciated export product of #Dutch #pop #music
00:00 - Introduction
02:17 - Focus (Vocal Version)
08:47 - Anonymous Two
09:41 - House of the King
12:55 - Who's calling
17:16 - All Hens on Deck
23:24 - Focus 4
28:06 - La Cathedrale De Strasbourg
35:34 - Funk in F (Sylvia Prologue)
37:28 - Sylvia
41:43 - Harem Scarem (Main Theme)
43:57 - Harem Scarem (Part 2) Guitar Solo
49:40 - Harem Scarem (Part 3) Raga Revenge (Swung Jam)
52:16 - Harem Scarem (Part 4) Bass Solo
56:29 - Harem Scarem (Part 5) Rhythm section jam (Anaya, improvised)
58:32 - Harem Scarem (Main Theme) (Reprise)
1:00:34 - Improvised Scarborough Fair (Flute Solo)
1:03:09 - Focus Zero (Improvised)
1:04:14 - Hocus Pocus
1:10:38 - Drum Solo
1:18:51 - Hocus Pocus (Reprise)
#musicvideo #50jaar #concert
#Autofocus is not necessarily your friend. To get this #Spider's #Web to appear in a #photograph, you can't rely on the camera's ability to #focus as the subject is much too fine; it always picks up the background. By switching to good old fashioned #ManualFocus, you can choose which element to home in on. I've seen the spider which owns this #website over a few days but it was probably sheltering from the light rain that is falling. If a bird had taken it, I suspect that it would have wrecked the web. I'll see if I can get a #picture of it later.
#MyWork #MyPhoto #CCBYSA #DSLR #Nikon #D7000 #Nature #Wildlife #WebsiteUnderConstruction
Beyond The Dutch 49: Spooky Action At The Funfair
A music podcast with your roving reporter Iris and radio veteran Raymond! Be prepared for weird accents and unpredictable musical picks! A music only episode, containing a nice mixture of several musical genres. You will hear music from Focus, Nevermen, O.R.k., Portico Quartet, Blacklist, Cory Wong, Cog, Lake Turner, Lifesigns, Tool, The Pineapple Thief, Down, The Fierce And The Dead, and Kaada.
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I've setup a fundraiser to help save for a new PC so I can continue my work as a music journalist. Want to help donate/share? Click here: http://fnd.us/c1o8oe?ref=sh_dAA421 Thank you so much! <3
All podcasts are ad and commercial free!
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#podcast #music #musicpodcast #progressiverock #progrock #prog #rock #indie #alternative #metal #jazz #fusion #electronicmusic #focus #nevermen #ork #porticoquartest #blacklist #corywong #cog #laketurner #lifesigns #tool #thepineapplethief #down #thefierceandthedead #kaada #radio #radioshow #mixcloud
Die Focus-Frage diese Woche: Essen sie Fleisch oder sind sie eine lustfeindliche Vegan-Feministin?
Was kommt dabei raus, wenn ein latent frauenfeindlicher Autor mit Fleisch-Fetisch einen Artikel über vegane Ernährung schreibt? Richtig, eine zutiefst alberne Abrechnung wider den Vegan-Feminismus, die dann Playboy und Focus abdrucken. Scheint ja gerade in Mode zu sein, sich gegen Dinge zu engagieren, deren Existenz nicht so ganz unumstritten ist. Ob man gegen einen deutschen Scharia-Staat auf die Straße geht, die weltweite, alle Piloten und Flughafen-Wartungstechniker umfassende Kondensstreifen-Verschwörung oder eben den Männer-hassenden Vegan-Feminismus, für den creative Wutbürger 2.0 reichen die vorhandenen Missstände nicht mehr aus, er erfindet noch welche dazu.
Ja, wir Männer haben es schon nicht leicht. Früher, da war die Welt noch ganz simpel aufgeteilt in starke, die Geschicke der Welt lenkende Männer einerseits und das ihnen angetraute Koch-, Gebär- und Putzpersonal auf der anderen, nicht so sonnigen Seite des Lebens. Auf der Arbeit konnten wir mit schweren, ölverschmierten Maschinen an gefährlich aussehenden Stahlklumpen rumfräsen oder einhändig Schiffsschrauben zerschweißen. In Bürojobs durften wir dann wenigstens noch um die Wette rauchen oder die Sekretärinnen wie reine Begattungsutensilien behandeln. Genug Möglichkeiten, Tag für Tag seine Männlichkeit unter Beweis zu stellen.
2014 war das nicht mehr so einfach, viele Alphamännchen scheinen angesichts der abrupten Veränderungen nachhaltig paralysiert....
#karnismus #politik #speziesismus #antispeziesismus #tierrechte #vegan #veganismus #wer-tiere-liebt-hält-sich-keine-haustiere #Tiere #tierversuche #feminismus #dergraslutscher #machos #männlich #focus #playboy #carstenotte #aufgeklärtercarnivore
