moonsizecut.frink

View or download moonsizecut.frink in plain text format


use sun.frink

// This program graphically draws the size (and phase) of the moon's closest
// point each day for many years.  It sort of debunks the idea that the
// so-called "supermoon" is really special at all.

g = new graphics

g.stroke[.1 mm]
g.color[0,0,1]
//g.rotate[4 deg]
//g.translate[1 in, 2 in]

width = 382 mm
height = 700 mm


x = 0
y = 0
lat = 40 degrees North
long = 105 degrees West
perline = 29

cellsize = width/perline

g.drawRectCenter[0 cellsize,0 cellsize, 80 .5 deg cellsize, 80 .5 deg cellsize]

for a = #2013-01-01# to #2016-01-01# step day
{
   interval = new interval[a, a + 1 day]
   r = moonRadiusAngle[interval]
   closest = supremum[r]

//  Use this instead to just draw the size of the moon.
//   g.fillEllipseCenter[x mod perline, x div perline, 200 closest, 200 closest]
   g.add[drawMoonPolygonRelativeToZenith[a+12 hours, lat, long, (x mod perline) cellsize, (x div perline) cellsize, 80 closest cellsize, false]]
   x = x + 1
}

g.show[]
g.write["moons.svg",width, height]
g.write["moons.png",1000,2000]
//g.printTiled[1,2]


View or download moonsizecut.frink in plain text format


This is a program written in the programming language Frink.
For more information, view the Frink Documentation or see More Sample Frink Programs.

Alan Eliasen was born 17897 days, 19 hours, 42 minutes ago.