moonsize.frink

Download or view moonsize.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
daynum = 0
lat = 40 degrees North
long = 105 degrees West
perline = 29

start = beginningOfYear[now[]]
end =   beginningOfYearPlus[now[], 1]
for a = start to end step day
{
   interval = new interval[a, a + 1 day]
   r = moonRadiusAngle[interval]
   closest = supremum[r]

//  Use this line instead to just draw the size of the moon and not its phase.
//   g.fillEllipseCenter[x mod perline, x div perline, 200 closest, 200 closest]
   g.add[drawMoonPolygonRelativeToZenith[a+12 hours, lat, long, daynum mod perline, daynum div perline, 100 closest, true]]
   daynum = daynum + 1
}

//g.font["SansSerif", "italic+bold", .95]
//g.text["A year of moons and another year of Sky & Telescope!", 28/2, 14]

// Comment this next line out to save printer ink.
g=g.invertGrays[]

g.show[]

g.write["moons.svg",1024,undef]
g.write["moons.png",1024,undef]
//g.printTiled[2,1]


Download or view moonsize.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 19945 days, 10 hours, 11 minutes ago.