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If any of the planets align, an error message is written to stderr. 24 | 25 | Inspired by: 26 | [How to compute planetary positions](http://www.stjarnhimlen.se/comp/ppcomp.html) 27 | 28 | 29 | Visual: [Current Geocentric and Heliocentric 30 | Planetary Positions](http://www.planetary-aspects.com/curr_asp/curr_posns.php) 31 | 32 | ## How to use? 33 | Since AstroBuild is just a simple python script you can integrate it to your favourite deploy/CI workflow e.g. as a prebuild task! 34 | -------------------------------------------------------------------------------- /astro_build.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | import math, itertools, sys, datetime 3 | 4 | 5 | ## values and abbrevations taken from http://www.stjarnhimlen.se/comp/ppcomp.html 6 | 7 | def calculate_day(year, month, day, hour): 8 | return 367*year - 7 * ( year + (month+9)/12 ) / 4 + 275*month/9 + day - 730530 + float(hour)/float(24) 9 | 10 | def get_planet(name, d): 11 | 12 | if name == "Sun": 13 | return { 14 | 'N': math.radians(0.0), 15 | 'i' : math.radians(0.0), 16 | 'w' : math.radians(282.9404 + 4.70935E-5 * d), 17 | 'a' : 1.000000, 18 | 'e' : 0.016709 - 1.151E-9 * d, 19 | 'M' : math.radians(356.0470 + 0.9856002585 * d) 20 | } 21 | elif name == 'Mercury': 22 | return { 23 | 'N': math.radians(48.3313 + 3.24587E-5 * d), 24 | 'i' : math.radians(7.0047 + 5.00E-8 * d), 25 | 'w' : math.radians(29.1241 + 1.01444E-5 * d), 26 | 'a' : 0.387098, 27 | 'e' : 0.205635 + 5.59E-10 * d, 28 | 'M' : math.radians(168.6562 + 4.0923344368 * d) 29 | } 30 | elif name == 'Venus': 31 | return { 32 | 'N' : math.radians(76.6799 + 2.46590E-5 * d), 33 | 'i' : math.radians(3.3946 + 2.75E-8 * d), 34 | 'w' : math.radians(54.8910 + 1.38374E-5 * d), 35 | 'a' : 0.723330, 36 | 'e' : 0.006773 - 1.302E-9 * d, 37 | 'M' : math.radians(48.0052 + 1.6021302244 * d) 38 | } 39 | elif name == 'Mars': 40 | return { 41 | 'N': math.radians(49.5574 + 2.11081E-5 * d), 42 | 'i' : math.radians(1.8497 - 1.78E-8 * d), 43 | 'w' : math.radians(286.5016 + 2.92961E-5 * d), 44 | 'a' : 1.523688, 45 | 'e' : 0.093405 + 2.516E-9 * d, 46 | 'M' : math.radians(18.6021 + 0.5240207766 * d) 47 | } 48 | elif name == 'Jupiter': 49 | return { 50 | 'N': math.radians(100.4542 + 2.76854E-5 * d), 51 | 'i' : math.radians(1.3030 - 1.557E-7 * d), 52 | 'w' : math.radians(273.8777 + 1.64505E-5 * d), 53 | 'a' : 5.20256, 54 | 'e' : 0.048498 + 4.469E-9 * d, 55 | 'M' : math.radians(19.8950 + 0.0830853001 * d) 56 | } 57 | elif name == 'Saturn': 58 | return { 59 | 'N': math.radians(113.6634 + 2.38980E-5 * d), 60 | 'i' : math.radians(2.4886 - 1.081E-7 * d), 61 | 'w' : math.radians(339.3939 + 2.97661E-5 * d), 62 | 'a' : 9.55475, 63 | 'e' : 0.055546 - 9.499E-9 * d, 64 | 'M' : math.radians(316.9670 + 0.0334442282 * d) 65 | } 66 | elif name == 'Uranus': 67 | return { 68 | 'N': math.radians(74.0005 + 1.3978E-5 * d), 69 | 'i' : math.radians( 0.7733 + 1.9E-8 * d), 70 | 'w' : math.radians(96.6612 + 3.0565E-5 * d), 71 | 'a' : 19.18171 - 1.55E-8 * d, 72 | 'e' : 0.047318 + 7.45E-9 * d, 73 | 'M' : math.radians(142.5905 + 0.011725806 * d) 74 | } 75 | elif name == 'Neptune': 76 | return { 77 | 'N': math.radians(131.7806 + 3.0173E-5 * d), 78 | 'i' : math.radians(1.7700 - 2.55E-7 * d), 79 | 'w' : math.radians(272.8461 - 6.027E-6 * d), 80 | 'a' : 30.05826 + 3.313E-8 * d, 81 | 'e' : 0.008606 + 2.15E-9 * d, 82 | 'M' : math.radians(260.2471 + 0.005995147 * d) 83 | } 84 | 85 | 86 | def calc_orbital_elements(planet_name, d): 87 | 88 | planet = get_planet(planet_name, d) 89 | 90 | N = planet.get('N') 91 | i = planet.get('i') 92 | w = planet.get('w') 93 | a = planet.get('a') 94 | e = planet.get('e') 95 | M = planet.get('M') 96 | 97 | E = M + e* math.sin(M) * ( 1.0 + e * math.cos(M) ) 98 | 99 | xv = a * ( math.cos(E) - e ) 100 | yv = a * ( math.sqrt(1.0 - e*e) * math.sin(E) ) 101 | 102 | v = math.atan2( yv, xv ) 103 | r = math.sqrt( xv*xv + yv*yv ) 104 | 105 | xh = r * ( math.cos(N) * math.cos(v+w) - math.sin(N) * math.sin(v+w) * math.cos(i) ) 106 | yh = r * ( math.sin(N) * math.cos(v+w) + math.cos(N) * math.sin(v+w) * math.cos(i) ) 107 | zh = r * ( math.sin(v+w) * math.sin(i) ) 108 | 109 | lonecl = math.atan2( yh, xh ) 110 | latecl = math.atan2( zh, math.sqrt(xh*xh+yh*yh) ) 111 | 112 | return { 113 | 'r' : r, 114 | 'v' : v, 115 | 'xh' : xh, 116 | 'yh' : yh, 117 | 'w' :w, 118 | 'lonecl' : lonecl, 119 | 'latecl ': latecl 120 | 121 | } 122 | 123 | 124 | def calc_geocentric_alignments(planet_name, d): 125 | 126 | sun = calc_orbital_elements('Sun', d) 127 | planet = calc_orbital_elements(planet_name, d) 128 | 129 | lonsun = sun.get('v') + sun.get('w') 130 | 131 | xs = sun.get('r') * math.cos(lonsun) 132 | ys = sun.get('r') * math.sin(lonsun) 133 | 134 | xh = planet.get('xh') 135 | yh = planet.get('yh') 136 | 137 | xg = xh + xs 138 | yg = yh + ys 139 | 140 | helio_degree = math.degrees(math.atan2( xh, yh )) 141 | geo_degree = math.degrees(math.atan2( xg, yg )) 142 | 143 | 144 | helio_degree = 90 - helio_degree 145 | geo_degree = 90 - geo_degree 146 | 147 | if helio_degree < 0: 148 | helio_degree = helio_degree + 360 149 | if geo_degree < 0: 150 | geo_degree = geo_degree + 360 151 | 152 | return geo_degree 153 | 154 | 155 | def check_alignments(alignments): 156 | 157 | for degree, grouped in itertools.groupby(alignments, lambda x: x[1]): 158 | planets = map(lambda x: x[0], grouped) 159 | if len(planets) > 1: 160 | sys.stderr.write("BUILD FAILED" + '\n') 161 | sys.stderr.write("PLANETS ALIGNED: " + str(planets)+'\n') 162 | sys.stderr.write("ALIGNMENT: " + str(int(degree)) +' degrees\n') 163 | sys.exit(1) 164 | 165 | sys.stdout.write('NO PLANETS ALIGNED\n') 166 | 167 | 168 | def main(): 169 | 170 | now = datetime.datetime.utcnow() 171 | d = calculate_day(now.year, now.month, now.day, now.hour) 172 | 173 | planet_names = ['Sun', 'Mercury', 'Venus', 'Mars', 'Jupiter', 'Saturn', 'Uranus', 'Neptune'] 174 | 175 | alignments = map(lambda x: [x, round(calc_geocentric_alignments(x, d))], planet_names) 176 | alignments.sort(key= lambda x: x[1]) 177 | 178 | check_alignments(alignments) 179 | 180 | 181 | main() 182 | --------------------------------------------------------------------------------