// Program to calculate moon crossing of the Infinite Corridor at MIT // known as "MIThenge" // // More info at also http://web.mit.edu/planning/www/mithenge.html // Thanks to Keith Winstein, Ken Olum, Lenny Foner, and Matthias Huerlemann // for various data and surveying assistance. // // For worked predictions, see https://futureboy.us/mithenge/ // // Alan Eliasen, eliasen@mindspring.com use mithengecorridor.frink use cambridgetempFourier.frink use sun.frink sep = "\t" preamble = "" html = false if length[ARGS] > 0 && ARGS@0 == "--html" { sep = "" preamble = "" html = true } date = #2019# dateOut = ### yyyy-MM-dd hh:mm:ss a zzz ### dateShort = ### yyyy-MM-dd ### tz = "US/Eastern" date = beginningOfYear[now[], tz] enddate = beginningOfYearPlus[date, 2, tz] temperature = cambridgeTemp[date] while (date <= enddate) { temperature = cambridgeTemp[date] date = moonSecantAzimuth[date, lat, long, corridorAzimuthMeeus, temperature, pressure] // Now refine with temperature for that time of day. temperature = cambridgeTemp[date] date = moonSecantAzimuth[date, lat, long, corridorAzimuthMeeus, temperature, pressure] [azimuth, altitude] = refractedMoonAzimuthAltitude[date, lat, long, temperature, pressure] print[preamble] print[(date -> [dateOut, tz]) + "\$sep"] print[format[JD[date],day,5] + "\$sep"] print[format[altitude,degrees,2] + "\$sep"] iFrac = moonIlluminatedFraction[date] print[format[iFrac, percent, 1] + "\$sep"] radiusAngle = moonRadiusAngle[date] print[format[F[temperature],1,0]] if altitude < (1.16 degrees + radiusAngle) and altitude > -radiusAngle { if !html print["\$sep*"] else { f = date -> [dateShort, tz] print[" [SVG]"] } println["\n\$date, \$lat, \$long, \$temperature, \$pressure, \$corridorAzimuth"] drawMoons[date, lat, long, temperature, pressure, corridorAzimuth] } println[] date = date + 25 hours } // Function to draw the path of the moon as it crosses the corridor. drawMoons[date, lat, long, temperature, pressure, corridorAzimuth] := { tz = "US/Eastern" g = new graphics g.font["SansSerif", .05 deg] // Draw doorway aperture [skyr,skyg,skyb] = skyDarkness[date, lat, long, [[.1,.1,.1], [.1,.1,.2], [.1,.1,.3], [.1,.1,.4], [.8,.8,1]]] g.color[skyr,skyg,skyb] g.fillRectSides[corridorAzimuth - .5 degrees, 0 degrees, corridorAzimuth + .5degrees, -.91 degrees] g.color[0,0,0,.7] g.drawRectSides[corridorAzimuth - .5 degrees, 0 degrees, corridorAzimuth + .5degrees, -.91 degrees] g.line[corridorAzimuth, 0 degrees, corridorAzimuth, -.93 degrees] g.color[0,0,0] d1 = date - 2 min do { [az, alt] = refractedMoonAzimuthAltitude[d1, lat, long, temperature, pressure] drawMoon[g, d1, lat, long, temperature, pressure] d1 = d1 - 2 min } while alt < 1.2 degrees d1 = date + 2 min do { [az, alt] = refractedMoonAzimuthAltitude[d1, lat, long, temperature, pressure] drawMoon[g, d1, lat, long, temperature, pressure] d1 = d1 + 2 min } while alt > 0 degrees drawMoon[g, date, lat, long, temperature, pressure] g.color[0,0,0,.7] // Draw floor g.fillRectSides[corridorAzimuth - 1 degree, 0 degrees, corridorAzimuth + 1 degree, .5 degrees] // Text description g.color[1,1,1] df = ###yyyy-MM-dd hh:mm:ss a zzz### g.font["SansSerif", "bold", .1 degrees] g.text[(date->[df,tz]), corridorAzimuth, .2 degrees] g.text["Illuminated fraction: " + format[moonIlluminatedFraction[date], percent, 1] + "%", corridorAzimuth, .3 degrees] // Render files sd = ###yyyy-MM-dd### g.write["moon" + (date->[sd, tz]) + ".png", 640, 480] g.write["moonthumb" + (date->[sd, tz]) + ".png", 100, 80] g.write["moon" + (date->[sd, tz]) + ".svg", 640, 480] // g.show[] } // Draw a single moon image with time/date stamp. drawMoon[g, date, lat, long, temperature, pressure] := { tz = "US/Eastern" shortDate = ###hh:mm:ss a### [azimuth, altitude] = refractedMoonAzimuthAltitude[date, lat, long, temperature, pressure] trueAz = (azimuth + 180 degrees) mod circle // println["True azimuth at \$date is " + (trueAz->degrees)] ra = moonRadiusAngle[date] // println["Radius angle is " + (ra->"degrees")] // Draw the moon g.color[1,1,1,.9] g.add[drawMoonPolygonRelativeToZenith[date, lat, long, trueAz, -altitude, ra , true]] g.color[0,0,0] g.add[drawMoonPolygonRelativeToZenith[date, lat, long, trueAz, -altitude, ra , false]] // Draw horizontal line to center of moon g.color[.7,.7,.7] g.line[trueAz - ra - 0.02 degree, -altitude, trueAz, -altitude] g.fillRectCenter[trueAz, -altitude, .02 degree, .02 degree] g.color[1,1,1,0.5] g.fillRectSides[trueAz - ra - .35 degree, -altitude - 0.025 deg, trueAz - ra - .02 degree, -altitude + 0.025 deg] g.color[0,0,0] g.text[(date -> [shortDate, tz]), trueAz - ra - .03 degree, -altitude, "right", "center"] // g.text[(date -> [shortDate, tz]), trueAz, -altitude] }