Download or view medievalPlanets.frink in plain text format
// Identifying a medieval astronomical diagram
// https://mobile.twitter.com/MaxFagin/status/1619826334460678146
use planets.frink
g = new graphics
for p = [Planet.Mercury, Planet.Venus, Planet.Mars, Planet.Jupiter, Planet.Saturn]
{
pl = new polyline
for d = now[] to now[] + 2 year step 5 day
{
[ra, decl, dist] = p.geocentricCoordinates[d]
epsilon = trueObliquityOfEcliptic[d]
[lambda, beta] = raDeclToEcliptical[ra, decl, epsilon]
pl.addPoint[beta, JD[d]]
}
g.color[randomFloat[0,.7], randomFloat[0,.7], randomFloat[0,.7]]
[x,y] = first[pl.getPoints[]]
g.text[p.getName[], x, y, "center", "bottom"]
[x,y] = last[pl.getPoints[]]
g.text[p.getName[], x, y, "center", "top"]
g.add[pl]
}
pl = new polyline
for d = now[] to now[] + 2 year step 1 day
{
[ra,decl] = moonApparentRADecl[d]
epsilon = trueObliquityOfEcliptic[d]
[lambda, beta] = raDeclToEcliptical[ra, decl, epsilon]
pl.addPoint[beta, JD[d]]
}
g.color[randomFloat[0,.7], randomFloat[0,.7], randomFloat[0,.7]]
[x,y] = first[pl.getPoints[]]
g.text["Moon", x, y, "center", "bottom"]
[x,y] = last[pl.getPoints[]]
g.text["Moon", x, y, "center", "top"]
g.add[pl]
g.show[]
g.write["medievalPlanets.png", 300, 1000]
Download or view medievalPlanets.frink in plain text format
This is a program written in the programming language Frink.
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Alan Eliasen was born 19963 days, 19 hours, 52 minutes ago.