moonsize.frink

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

for a = #2015-01-01# to #2015-12-31# 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, x div perline, 100 closest, true]]
   x = x + 1
}

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


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


View or download 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 17592 days, 15 hours, 34 minutes ago.