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Dec 10, 2018
Exploration of NASA Acronyms with Multiple MeaningsCode.nasa.gov Data ExplorationsUntitledUntitledQuick Exploration of a selected subset of the DATA.NASA.GOV's data.json file. Not all the metadata but a selection so people can understand the fields that exist in the data schema.UntitledUntitledComparing human-generated vs. A.I.-generated keyword tags on Code.nasa.govFind Labor Hours To Generate OpenSouce NASA Code Since A Selected DateNASA's Open-Source Code Projects: NLP Generated Tags ClusterStars and constellations IIExoplanetsPublic Engagement with NASA's Open-Source Code Projects on GithubMapping Across TimeFinding Recent Additions to Code.nasa.govVisitors to .gov websites via API from analytics.usa.gov. NASA examplesLicenses of Open-Source NASA code projects on code.govNASA's Open-Source Code ProjectsMeteorite landingsUntitledPhases of the MoonInverted Nasa PhotosAsteroids API <a href="https://api.nasa.gov/api#neows-swagger">(N.E.O.)</a> ExplorationNASA Api ExplorerGithub Api ExplorerColor Rendering of SpectraMeteorite landingsGlobal Temperature TrendsWorking with data from transcriptsWorld Population Line GraphsList of Agencies using NOSA License in Projects on code.govGlobal surface temperature changeGISTEMP nos enseña sobre el calentamiento globalRe: “Can Moons Have Moons?”Distance to shoreEPIC “Blue Marble” BrowserRequest PlaygroundAnálisis de temperatura de superficie GISS (GISTEMP)Global Temperature TrendsNight Skies — Lights and Light Pollution WebGL GlobeSatellite ground track visualizerPt. 2 Can sound add value to data visualizations?
Geometric Algebra Solar System Simulation
// Create a Clifford Algebra with 3,0,1 metric.
Algebra({p:3,q:0,r:1,baseType:Float64Array},()=>{
// Basic GA points and vectors. (in KM)
var point = (x,y,z)=>1e123-x*1000e012+y*1000e013+z*1000e023,
vector = (x,y,z)=>-x*1000e012+y*1000e013+z*1000e023;
// Data from https://ssd.jpl.nasa.gov/horizons.cgi on 16/01/2018, mass, x,y,z, vx,vy,vz - units KM/S
var S = {
Sun : [1.988544E30,
point( 2.564294388666002E+05, 9.282480498916068E+05,-1.766238790604926E+04),
vector(-1.032271613682197E-02, 8.506510987745193E-03, 2.500579386306204E-04)],
Mercury : [3.302E23 ,
point(-4.261433008703040E+07,-5.180047961851221E+07,-3.933312499175891E+05),
vector( 2.791200817718316E+01,-2.845907905315504E+01,-4.887507665269149E+00)],
Venus : [48.685E23 ,
point( 5.357396412032661E+07,-9.395832506522638E+07,-4.396021713049673E+06),
vector( 3.028389624261208E+01, 1.704407507992616E+01,-1.514240016876114E+00)],
Earth : [5.97219E24 ,
point(-6.321181522689363E+07, 1.337035149539065E+08,-2.323422257646173E+04),
vector(-2.738214042693713E+01,-1.295254402346621E+01, 1.833826936016081E-03)],
Mars : [6.4185E23 ,
point(-2.261872038770745E+08,-8.456074820817514E+07, 3.748261255788427E+06),
vector( 9.452949401620625E+00,-2.058946931255050E+01,-6.636171336482146E-01)],
Jupiter : [1898.13E24 ,
point(-6.267852905434124E+08,-5.152098357372769E+08, 1.615654184230065E+07),
vector( 8.141900694513106E+00,-9.472185978646950E+00,-1.428289208967608E-01)],
},
G = 6.6723E-11, start = 1516057200000, count=0, scale=.2E-14,
names = Object.keys(S), mass = names.map(x=>S[x][0]),
state = [].concat.apply([],names.map(x=>S[x].slice(1)));
// RK4 integrator. f = derivative function, y = state vector, h = step
// Thanks to ganja.js operator overloading, you can call the code below with scalars, multivectors and arrays.
var RK4 = (f,y,h)=>{
var k1=f(y),
k2=f(y+0.5*h*k1),
k3=f(y+0.5*h*k2),
k4=f(y+h*k3);
return y+(h/3)*(k2+k3+(k1+k4)*0.5);
};
// Acceleration of p1,m1 due to gravity between p1,m1 and p2,m2
var A=(p1,p2,m1,m2)=>{ var v=p2-p1, d=v.VLength; return G*m1*m2/(d*d*m1)*v/d; }
// Derivative function .. returns x' given x
// State contains positions and velocities for each of the planets.
var dFunc = (s)=>s.map((si,i)=>
// the new velocity is the old acceleration.
((i%2==0)?s[i+1]
// the new acceleration is calculated by accumulating attraction from all planets.
:(mass.reduce((F,x,j)=>((i-1)/2==j)?F:F+A(s[i-1],s[j*2],mass[(i-1)/2],x),0)))
);
// Graph the 3D items
return(this.graph(()=>{
state = RK4(dFunc,state,14400);
return [].concat.apply(
// display the current time.
[(new Date(start+(count++)*14400000)).toDateString().replace((/.*? /),'')],
// display points and titles for all the planets
names.map((x,xi)=>[point(state[xi*2].e012*scale,state[xi*2].e013*scale,state[xi*2].e023*scale),0x888888,x,0])
)
},{animate:true}));
})
Algebra = require('ganja.js')
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