# manhattanhengemoon.frink

``` // Program to calculate moon alignments with the East-West streets in // Manhattan. use sun.frink use Grid.frink North = +1 South = -1 West = +1 East = -1 lat = DMS[40,45,261.16] North long = DMS[73,59,9.02] West // Approximate direction of the streets. // see http://en.wikipedia.org/wiki/Manhattanhenge // http://www.charlespetzold.com/etc/AvenuesOfManhattan/index.html axis = (270 + 29.008) degrees // Conversion to coordinate system used by Meeus axisMeeus = (axis + 180 degrees) mod circle date = #2000-01-01 12:00# dateOut = ### yyyy-MM-dd hh:mm:ss a zzz ### sep = "\t" tz = "US/Eastern" g = new graphics while (date <= #2031-12-31#) {    date = moonSecantAzimuth[date, lat, long, axisMeeus]        [azimuth, altitude] = refractedMoonAzimuthAltitude[date, lat, long]    if (altitude > -0.25 deg)    {       print[(date -> [dateOut, tz]) + sep]       print[format[JD[date],day,5] + sep]       print[format[altitude,degrees,2] + sep]       print[format[moonIlluminatedFraction[date], percent, 1] + sep]       print[skyDarkness[date, lat, long] + sep]       radiusAngle = moonRadiusAngle[date]       g.fillRectCenter[JD[date], -altitude, 3 day, 2 radiusAngle]       println[]    }        date = date + 1 day } grid = new Grid grid.font["Monospaced", 0.1 degree] minorxtick = 1 month minorytick = .1 degree //grid.makeHorizontalLines[g, minorytick, false] grid.makeVerticalCalendarLines[g, Grid.MONTH, false, tz] majorytick = 1 degree // Major labels grid.color[0,0,0] grid.makeHorizontalLabels[g, majorytick, -1 degree, false] grid.makeVerticalCalendarLabels[g, Grid.YEAR, false, tz] grid.color[0.5,0.5,0.5,0.3] grid.makeHorizontalLines[g, majorytick, false] grid.makeVerticalCalendarLines[g, Grid.YEAR, false, tz] g.add[grid.g2] g.show[] g.write["manhattanhengemoon.svg",2048, 2048] g.write["manhattanhengemoon.html",2048, 2048] ```

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 18492 days, 22 hours, 41 minutes ago.