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astro
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#!/usr/bin/perl -w
# Calculate Sun and Moon position, calculate EME conditions.
# License: GPLv3
# A portion is derived from the WSJT/WSJT-X project.
#
# Copyright (C) 2001 - 2017 by Joe Taylor, K1JT.
# Copyright (c) 2018 /u/molo1134
use strict;
use utf8;
use feature 'unicode_strings';
use Astro::Coord::ECI;
use Astro::Coord::ECI::Moon;
use Astro::Coord::ECI::Sun;
#use Astro::Coord::ECI::Utils qw{deg2rad rad2deg};
use URI::Escape;
use Math::Round;
use Math::Trig;
use POSIX qw(floor strftime);
binmode(STDOUT, ":utf8");
use File::Basename;
use Cwd 'realpath';
use lib dirname(realpath(__FILE__));
use Colors;
use Location;
my $username = $ENV{'USER'} || $ENV{'USERNAME'} || getpwuid($<);
# change this to 0 to always exit with success
our $exitnonzeroonerror = 1;
$exitnonzeroonerror = 0 if $username eq 'eggdrop';
if ($#ARGV < 0 || length($ARGV[0]) == 0) {
print "usage: $0 [--moon] [--eme] [--sun] [--graves] \\\n\t<grid>|<qth> [<elev>ft|<elev>m]\n";
exit $exitnonzeroonerror;
}
my $doEme = 0;
my $doMoon = 0;
my $doSun = 0;
my $doGraves = 0;
my $now = time();
#$now = 1487653200; ## high degredation
#$now = 1488053200; ## new moon
#$now = 1515572994; ## GRAVES illuminated
# eggdrop doesn't split args on spaces
@ARGV=split(' ', join(' ',@ARGV));
my $query = "";
my $elev_m = "0";
my $i = 0;
while ($i <= $#ARGV) {
if ( $ARGV[$i] =~ /^([0-9]+)(ft|m)/ ) {
if ($2 eq "m") {
$elev_m = $1;
} elsif ($2 eq "ft") {
$elev_m = $1 * 0.3048; # feet to meters
}
} elsif ($ARGV[$i] =~ /^--moon$/) {
$doMoon = 1;
} elsif ($ARGV[$i] =~ /^--sun$/) {
$doSun = 1;
} elsif ($ARGV[$i] =~ /^--graves$/) {
$doGraves = 1;
} elsif ($ARGV[$i] =~ /^--eme$/) {
$doMoon = 1;
$doEme = 1;
} elsif ($ARGV[$i] =~ /^--date$/) {
# undocumented -- unix timestamp
$now = $ARGV[++$i];
} else {
$query .= " " unless $i == 0;
$query .= $ARGV[$i];
}
$i++;
}
#print "$query\n";
#print "$elev_m\n";
if ($doMoon == 0 && $doSun == 0 && $doGraves == 0) {
# no data was selected, so do all.
$doMoon = 1;
$doEme = 1;
$doSun = 1;
$doGraves = 1;
}
my ($lat, $lon) = (0, 0);
if ($query eq "" && ($doMoon == 1 || $doSun == 1)) {
print "usage: !eme <qth>|<grid>" if $username eq "eggdrop" && $doEme == 1;
print "usage: !sun <qth>|<grid>" if $username eq "eggdrop" && $doSun == 1;
print "usage: !moon <qth>|<grid>" if $username eq "eggdrop" && $doMoon == 1 && $doEme == 0;
exit $exitnonzeroonerror;
}
my $highlight="vt220";
$highlight = "none" if ! -t STDOUT;
$highlight = "irc" if $username eq "eggdrop";
my $result;
$result = argToCoords($query) unless $query eq "" and $doGraves == 1;
if (!defined $result and $query ne "") {
print "error: \"$query\" not found\n";
exit $exitnonzeroonerror;
}
($lat, $lon) = split(',', $result) if defined $result;
#print "$lat, $lon\n";
# 1600 Pennsylvania Ave, Washington DC USA
# latitude 38.899 N, longitude 77.038 W,
# altitude 16.68 meters above sea level
#my $lat = deg2rad (38.899); # Radians
#my $long = deg2rad (-77.038); # Radians
#my $alt = 16.68 / 1000; # Kilometers
my $moon = Astro::Coord::ECI::Moon->new();
my $sun = Astro::Coord::ECI::Sun->new();
my $sta = Astro::Coord::ECI->universal($now)->
geodetic(deg2rad($lat), deg2rad($lon), $elev_m / 1000); #kilometers
$sta->set(refraction => 0);
$moon->set(refraction => 0);
$sun->set(refraction => 0);
$sta->universal($now);
$moon->universal($now);
$sun->universal($now);
my ($moon_az, $moon_el, $moon_range) = getAzElRng($sta, $moon);
my $earthradius = 6371;
my ($minrange, $maxrange) = (356375 - $earthradius, 406720 - $earthradius); # perigee, apogee
my $loss2m = emePathLoss($moon_range, 144.1);
my $minloss2m = emePathLoss($minrange, 144.1); # loss at minimum perigee
#my $maxloss2m = emePathLoss($maxrange - $earthradius, 144.1); # loss at maximum apogee
my $percentRange = round(($moon_range - $minrange) / ($maxrange - $minrange) * 100);
my $lossdiff = round(($loss2m - $minloss2m)*10)/10;
my ($phase, $illum) = $moon->phase($now);
$phase = rad2deg($phase);
my ($phasetext, $phaseunicode) = phaseText($phase);
#$phaseunicode = "" if $username eq "eggdrop";
$phasetext = red($phasetext)
if ($doEme == 1 && $phasetext eq "new moon");
$illum = round($illum * 100);
if ($doMoon == 1) {
if ($moon_el < 0) {
print bold("Moon"), " is ", red("set"), ";";
} else {
print bold("Moon"), " az/el ", bold("$moon_az°/$moon_el°"), "; dist $moon_range km;";
}
print " phase: $phasetext$phaseunicode, $illum% illum.;";
}
# rise/set
my ($eventtime, $rise) = $sta->next_elevation ($moon);
my ($h, $m) = getTimeRemaining($now, $eventtime);
print " Moon will @{[$rise ? 'rise' : 'set']} at ",
strftime("%Y-%m-%d %H:%Mz", gmtime($eventtime)), " (in ${h}h${m}m);"
if $doMoon == 1;
my ($moon_ra, $moon_dec, $moon_ra_range) = $moon->equatorial();
$moon_ra = rad2deg($moon_ra);
my $moon_h = ($moon_ra / 360) * 24;
my $moon_m = ($moon_h - floor($moon_h)) * 60;
my $moon_s = ($moon_m - floor($moon_m)) * 60;
$moon_h = floor($moon_h);
$moon_m = floor($moon_m);
$moon_s = round($moon_s);
$moon_dec = rad2deg($moon_dec);
my $moon_dd = $moon_dec;
my $moon_dm = ($moon_dd - floor($moon_dd)) * 60;
my $moon_ds = ($moon_dm - floor($moon_dm)) * 60;
$moon_dd = floor($moon_dd);
$moon_dm = floor($moon_dm);
$moon_ds = round($moon_ds);
$moon_ra_range = round($moon_ra_range);
#print "\nMoon ra, dec, range: $moon_ra, $moon_dec, $moon_ra_range\n";
#print "\nMoon ra/dec: ${moon_h}h${moon_m}m${moon_s}s $moon_dd°$moon_dm'$moon_ds\" range $moon_ra_range km\n";
my $degd = degredation($moon_ra, $moon_dec, 144.100);
print " EME degrd(2m): $degd dB (" . degredationQuality($degd) . ");"
if $doEme == 1;
print " EME path loss(2m): $loss2m dB (", lossDiffColor($lossdiff), ", $percentRange%);" if $doEme == 1 and $moon_el >= 0;
print "\n" if $doMoon == 1;
#my ($az, $el, $range) = $sta->azel($sun);
my ($sun_az, $sun_el, $sun_range) = getAzElRng($sta, $sun);
if ($doSun == 1) {
if ($sun_el < 0) {
print bold("Sun"), " is set;";
} else {
print bold("Sun"), " az/el ", bold("$sun_az°/$sun_el°"), ";";
}
my ($time, $rise) = $sta->next_elevation ($sun);
my $h = floor(($time - $now) / (3600));
my $m = floor(((($time - $now) / 3600) - $h) * 60);
print " Sun will @{[$rise ? 'rise' : 'set']} at ",
strftime("%Y-%m-%d %H:%Mz", gmtime($time)), " (in ${h}h${m}m)\n";
}
# GRAVES radar -- see https://en.wikipedia.org/wiki/Graves_(system)
# see http://www.itr-datanet.com/~pe1itr/pdf/The%20143.050MHz%20Graves%20Radar%20a%20VHF%20Beacon.pdf
# illuminates southern sky in France
if ($doGraves == 1) {
$lat = 47.3480;
$lon = 4.5151;
$elev_m = 204;
my $graves = Astro::Coord::ECI->
universal ($now)->
geodetic (deg2rad($lat), deg2rad($lon), $elev_m / 1000); #kilometers
$graves->set(refraction => 0);
$graves->universal($now);
$moon->universal($now);
my ($graves_az, $graves_el, $graves_range) = getAzElRng($graves, $moon);
print bold("GRAVES"), " Radar: Moon ";
if ($graves_az >= 90 && $graves_az <= 270 && $graves_el >= 15 && $graves_el <= 40) {
print green("Illuminated"), ", 143.050 MHz: az/el $graves_az°/$graves_el°\n";
} else {
if ($graves_el < 0) {
print "is ", red("set"), "\n";
} else {
print red("outside of beam"), "; az/el $graves_az°/$graves_el°\n";
}
}
}
exit 0;
sub log10 {
my $n = shift;
return log($n)/log(10);
}
# emePathLoss( dist_km, freq_MHz )
# from wikipedia:
# https://en.wikipedia.org/w/index.php?title=Earth%E2%80%93Moon%E2%80%93Earth_communication&oldid=759977305
sub emePathLoss {
my $d = shift;
my $f = shift;
my $loss = ((20 * log10($f)) + (40 * log10($d)) - 14.49);
return round($loss * 10) / 10;
}
# From wsjt astro.f90 -- translated from Fortran
sub degredation {
my $RAMoon = shift;
my $DecMoon = shift;
my $freq = shift;
# data nt144/ &
# 234, 246, 257, 267, 275, 280, 283, 286, 291, 298, &
# 305, 313, 322, 331, 341, 351, 361, 369, 376, 381, &
# 383, 382, 379, 374, 370, 366, 363, 361, 363, 368, &
# 376, 388, 401, 415, 428, 440, 453, 467, 487, 512, &
# 544, 579, 607, 618, 609, 588, 563, 539, 512, 482, &
# 450, 422, 398, 379, 363, 349, 334, 319, 302, 282, &
# 262, 242, 226, 213, 205, 200, 198, 197, 196, 197, &
# 200, 202, 204, 205, 204, 203, 202, 201, 203, 206, &
# 212, 218, 223, 227, 231, 236, 240, 243, 247, 257, &
# 276, 301, 324, 339, 346, 344, 339, 331, 323, 316, &
# 312, 310, 312, 317, 327, 341, 358, 375, 392, 407, &
# 422, 437, 451, 466, 480, 494, 511, 530, 552, 579, &
# 612, 653, 702, 768, 863,1008,1232,1557,1966,2385, &
# 2719,2924,3018,3038,2986,2836,2570,2213,1823,1461, &
# 1163, 939, 783, 677, 602, 543, 494, 452, 419, 392, &
# 373, 360, 353, 350, 350, 350, 350, 350, 350, 348, &
# 344, 337, 329, 319, 307, 295, 284, 276, 272, 272, &
# 273, 274, 274, 271, 266, 260, 252, 245, 238, 231/
my @nt144 = ( 234, 246, 257, 267, 275, 280, 283, 286, 291, 298,
305, 313, 322, 331, 341, 351, 361, 369, 376, 381,
383, 382, 379, 374, 370, 366, 363, 361, 363, 368,
376, 388, 401, 415, 428, 440, 453, 467, 487, 512,
544, 579, 607, 618, 609, 588, 563, 539, 512, 482,
450, 422, 398, 379, 363, 349, 334, 319, 302, 282,
262, 242, 226, 213, 205, 200, 198, 197, 196, 197,
200, 202, 204, 205, 204, 203, 202, 201, 203, 206,
212, 218, 223, 227, 231, 236, 240, 243, 247, 257,
276, 301, 324, 339, 346, 344, 339, 331, 323, 316,
312, 310, 312, 317, 327, 341, 358, 375, 392, 407,
422, 437, 451, 466, 480, 494, 511, 530, 552, 579,
612, 653, 702, 768, 863,1008,1232,1557,1966,2385,
2719,2924,3018,3038,2986,2836,2570,2213,1823,1461,
1163, 939, 783, 677, 602, 543, 494, 452, 419, 392,
373, 360, 353, 350, 350, 350, 350, 350, 350, 348,
344, 337, 329, 319, 307, 295, 284, 276, 272, 272,
273, 274, 274, 271, 266, 260, 252, 245, 238, 231);
# call coord(0.,0.,-1.570796,1.161639,RAMoon/rad,DecMoon/rad,el,eb)
my ($el, $eb) = coord(0.0, 0.0, -1.570796, 1.161639,
deg2rad($RAMoon), deg2rad($DecMoon));
# longecl_half=nint(rad*el/2.0)
my $longecl_half = round(rad2deg($el)/2.0);
# if(longecl_half.lt.1 .or. longecl_half.gt.180) longecl_half=180
if ($longecl_half < 1.0 || $longecl_half > 180.0) {
$longecl_half = 180;
}
# t144=nt144(longecl_half)
my $t144 = $nt144[$longecl_half - 1];
# tsky=(t144-2.7)*(144.0d6/freq8)**2.6 + 2.7 !Tsky for obs freq
my $tsky = ($t144 - 2.7) * (144.0 / $freq) ** 2.6 + 2.7;
# tr=80.0 !Good preamp
my $tr = 80.0;
# tskymin=13.0*(408.0d6/freq8)**2.6 !Cold sky temperature
my $tskymin = 13.0 * (408.0 / $freq) ** 2.6;
# tsysmin=tskymin+tr
my $tsysmin = $tskymin + $tr;
# tsys=tsky+tr
my $tsys = $tsky + $tr;
# dgrd=-10.0*log10(tsys/tsysmin) + dbMoon
my $dgrd = 10.0 * log10($tsys/$tsysmin); # XXX dbMoon?
return round($dgrd * 10)/10;
}
sub degredationQuality {
my $degd = shift;
if ($degd <= 1.5) {
return green("Excellent");
}
if ($degd > 1.5 && $degd <= 2.5) {
return green("Good");
}
if ($degd > 2.5 && $degd <= 4.0) {
return yellow("Fair");
}
if ($degd > 4.0 && $degd <= 5.5) {
return red("Poor");
}
if ($degd > 5.5) {
return darkRed("Very Poor");
}
}
# from wsjt coord.f90 -- translated from Fortran
sub coord {
my $a0 = shift;
my $b0 = shift;
my $ap = shift;
my $bp = shift;
my $a1 = shift;
my $b1 = shift;
my ($a2, $b2);
# SUBROUTINE COORD(A0,B0,AP,BP,A1,B1,A2,B2)
#
# ! Examples:
# ! 1. From ha,dec to az,el:
# ! call coord(pi,pio2-lat,0.,lat,ha,dec,az,el)
# ! 2. From az,el to ha,dec:
# ! call coord(pi,pio2-lat,0.,lat,az,el,ha,dec)
# ! 3. From ra,dec to l,b
# ! call coord(4.635594495,-0.504691042,3.355395488,0.478220215,
# ! ra,dec,l,b)
# ! 4. From l,b to ra,dec
# ! call coord(1.705981071d0,-1.050357016d0,2.146800277d0,
# ! 0.478220215d0,l,b,ra,dec)
# ! 5. From ra,dec to ecliptic latitude (eb) and longitude (el):
# ! call coord(0.d0,0.d0,-pio2,pio2-23.443*pi/180,ra,dec,el,eb)
# ! 6. From ecliptic latitude (eb) and longitude (el) to ra,dec:
# ! call coord(0.d0,0.d0,-pio2,pio2-23.443*pi/180,el,eb,ra,dec)
#
# SB0=sin(B0)
my $sb0 = sin($b0);
# CB0=cos(B0)
my $cb0 = cos($b0);
# SBP=sin(BP)
my $sbp = sin($bp);
# CBP=cos(BP)
my $cbp = cos($bp);
# SB1=sin(B1)
my $sb1 = sin($b1);
# CB1=cos(B1)
my $cb1 = cos($b1);
# SB2=SBP*SB1 + CBP*CB1*cos(AP-A1)
my $sb2 = $sbp*$sb1 + $cbp*$cb1*cos($ap-$a1);
# CB2=SQRT(1.e0-SB2**2)
my $cb2 = sqrt(1.0 - $sb2**2);
# B2=atan(SB2/CB2)
$b2 = atan($sb2/$cb2);
# SAA=sin(AP-A1)*CB1/CB2
my $saa = sin($ap-$a1)*$cb1/$cb2;
# CAA=(SB1-SB2*SBP)/(CB2*CBP)
my $caa = ($sb1 - $sb2 * $sbp)/($cb2*$cbp);
# CBB=SB0/CBP
my $cbb = $sb0/$cbp;
# SBB=sin(AP-A0)*CB0
my $sbb = sin($ap-$a0)*$cb0;
# SA2=SAA*CBB-CAA*SBB
my $sa2 = $saa*$cbb-$caa*$sbb;
# CA2=CAA*CBB+SAA*SBB
my $ca2 = $caa * $cbb + $saa * $sbb;
# TA2O2=0.0 !Shut up compiler warnings. -db
my $ta2o2 = 0.0;
# IF(CA2.LE.0.e0) TA2O2=(1.e0-CA2)/SA2
if ($ca2 <= 0.0) {
$ta2o2=(1.0-$ca2)/$sa2;
}
# IF(CA2.GT.0.e0) TA2O2=SA2/(1.e0+CA2)
if ($ca2 > 0.0) {
$ta2o2 = $sa2 / (1.0 + $ca2);
}
# A2=2.e0*atan(TA2O2)
$a2 = 2.0 * atan($ta2o2);
# IF(A2.LT.0.e0) A2=A2+6.2831853
if ($a2 < 0.0) {
$a2 = $a2 + 6.2831853
}
# RETURN
# END SUBROUTINE COORD
return ($a2, $b2);
}
sub getAzElRng {
my $sta = shift;
my $obj = shift;
my ($az, $el, $rng) = $sta->azel($obj);
$az = round(rad2deg($az) * 10) / 10;
$el = round(rad2deg($el) * 10) / 10;
$rng = round($rng);
return ($az, $el, $rng);
}
sub getTimeRemaining {
my $now = shift;
my $event = shift;
my $h = floor(($eventtime - $now) / (3600));
my $m = floor(((($eventtime - $now) / 3600) - $h) * 60);
return ($h, $m);
}
sub phaseText {
my $phase = shift; # phase in degrees; 0 = new moon; 180 = full moon
my $text = undef;
my $unicode = undef;
if ($phase < 22.5 || $phase > 337.5) {
$text = "new moon";
$unicode = "🌑";
} elsif (22.5 <= $phase && $phase < 67.5) {
$text = "wax. cres.";
$unicode = "🌒";
} elsif (67.5 <= $phase && $phase < 112.5) {
$text = "1st qrtr.";
$unicode = "🌓";
} elsif (112.5 <= $phase && $phase < 157.5) {
$text = "wax. gibb.";
$unicode = "🌔";
#$unicode = "\xF0\x9F\x8C\x94"; # 🌔 -- U+1F314 is outside of tcl range
} elsif (157.5 <= $phase && $phase < 202.5) {
$text = "full moon";
$unicode = "🌕";
} elsif (202.5 <= $phase && $phase < 247.5) {
$text = "wan. gibb.";
$unicode = "🌔";
} elsif (247.5 <= $phase && $phase < 292.5) {
$text = "3rd qrtr.";
$unicode = "🌓";
} elsif (292.5 <= $phase && $phase < 337.5) {
$text = "wan. cres.";
$unicode = "🌘";
}
return ($text, $unicode);
}
sub lossDiffColor {
my $lossdiff = shift;
my $text = "+$lossdiff dB";
if ($lossdiff <= 1) {
return green($text);
} elsif ($lossdiff <= 2) {
return yellow($text);
} else {
return red($text);
}
}