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 19920 days, 9 hours, 1 minutes ago.