watson/fullmoon.py

import arrow
import bisect

# timestamps for fullmoons between year 2000 and 2099
# data source http://home.hiwaay.net/~krcool/Astro/moon/fullmoon.htm

fullmoons = [
  948429720, 950977680, 953527560, 956079780, 958635300, 961194480,
  963755820, 966316440, 968873880, 971427240, 973977360, 976525500,
  979071960, 981616380, 984158640, 986700240, 989243700, 991791660,
  994345560, 996904620, 999467040, 1002030600, 1004593320, 1007153400,
  1009708920, 1012258320, 1014801480, 1017340020, 1019876580, 1022414040,
  1024955100, 1027501680, 1030055400, 1032616800, 1035184860, 1037756100,
  1040325060, 1042886940, 1045439520, 1047983760, 1050521880, 1053056280,
  1055589480, 1058124180, 1060663740, 1063211820, 1065770940, 1068340500,
  1070915880, 1073490060, 1076057280, 1078614960, 1081163040, 1083702900,
  1086236460, 1088766600, 1091297160, 1093832580, 1096377000, 1098932940,
  1101499740, 1104073680, 1106649180, 1109220900, 1111784400, 1114337280,
  1116879600, 1119413700, 1121943660, 1124474040, 1127008860, 1129551300,
  1132102740, 1134663420, 1137232140, 1139805900, 1142379420, 1144946520,
  1147503180, 1150049040, 1152586980, 1155120840, 1157654520, 1160190780,
  1162731540, 1165278360, 1167832740, 1170395220, 1172963880, 1175534160,
  1178100660, 1180659900, 1183211400, 1185756480, 1188297300, 1190835960,
  1193374380, 1195914660, 1198459020, 1201008960, 1203564720, 1206124860,
  1208687220, 1211249580, 1213810320, 1216368000, 1218921480, 1221470100,
  1224014640, 1226557140, 1229099940, 1231644480, 1234191060, 1236739200,
  1239289080, 1241841780, 1244398380, 1246958580, 1249520220, 1252080300,
  1254636660, 1257189300, 1259739180, 1262286900, 1264832340, 1267375200,
  1269916080, 1272457260, 1275001740, 1277551920, 1280108280, 1282669560,
  1285233540, 1287797880, 1290360480, 1292919300, 1295472180, 1298018280,
  1300558320, 1303094760, 1305630600, 1308168900, 1310712060, 1313261940,
  1315819680, 1318385280, 1320956280, 1323527820, 1326094260, 1328651760,
  1331199720, 1333740060, 1336275420, 1338808380, 1341341640, 1343878140,
  1346421600, 1348975260, 1351540320, 1354114080, 1356690120, 1359261600,
  1361824080, 1364376540, 1366919940, 1369456020, 1371987240, 1374517080,
  1377049620, 1379589300, 1382139600, 1384701480, 1387272600, 1389848040,
  1392422100, 1394989800, 1397547840, 1400095020, 1402632780, 1405164360,
  1407694260, 1410226800, 1412765520, 1415312640, 1417868940, 1420433700,
  1423005060, 1425578820, 1428149220, 1430710980, 1433262000, 1435803660,
  1438339440, 1440873420, 1443408720, 1445947560, 1448491500, 1451041980,
  1453600080, 1456165320, 1458734520, 1461302700, 1463865360, 1466420640,
  1468969140, 1471512540, 1474052820, 1476591900, 1479131580, 1481674020,
  1484220960, 1486773240, 1489330500, 1491890940, 1494452640, 1497013860,
  1499573340, 1502129580, 1504681440, 1507228860, 1509773040, 1512316140,
  1514859960, 1517405280, 1519951920, 1522499880, 1525050000, 1527603660,
  1530161700, 1532722920, 1535284680, 1537844040, 1540399560, 1542951660,
  1545501000, 1548047820, 1550591640, 1553132640, 1555672440, 1558213980,
  1560760320, 1563313200, 1565872260, 1568435640, 1571000940, 1573565760,
  1576127640, 1578684180, 1581233700, 1583776140, 1586313420, 1588848420,
  1591384500, 1593924360, 1596470400, 1599024180, 1601586360, 1604155860,
  1606728660, 1609298940, 1611861420, 1614413940, 1616957400, 1619494440,
  1622027760, 1624560120, 1627094340, 1629633780, 1632182160, 1634741880,
  1637312340, 1639888620, 1642463400, 1645030680, 1647587940, 1650135420,
  1652674560, 1655207580, 1657737540, 1660268160, 1662803940, 1665348960,
  1667905440, 1670472600, 1673046600, 1675621800, 1678192920, 1680755760,
  1683308160, 1685850180, 1688384340, 1690914720, 1693445760, 1695981480,
  1698524700, 1701076680, 1703637300, 1706205360, 1708777920, 1711350120,
  1713916260, 1716472500, 1719018540, 1721557080, 1724091960, 1726626900,
  1729164480, 1731706200, 1734253380, 1736807340, 1739368500, 1741935360,
  1744503840, 1747069080, 1749627960, 1752179880, 1754726160, 1757268540,
  1759808880, 1762348860, 1764890160, 1767434640, 1769983860, 1772538000,
  1775096040, 1777656300, 1780217220, 1782777480, 1785335820, 1787890800,
  1790441400, 1792987980, 1795532100, 1798075800, 1800620340, 1803165960,
  1805712420, 1808260200, 1810810860, 1813365960, 1815925620, 1818487860,
  1821049560, 1823608140, 1826162880, 1828714260, 1831262700, 1833807960,
  1836349740, 1838889000, 1841428260, 1843971060, 1846519980, 1849075920,
  1851637800, 1854203220, 1856769540, 1859334120, 1861894200, 1864447500,
  1866993180, 1869532140, 1872067140, 1874601600, 1877138700, 1879681080,
  1882230780, 1884789060, 1887355800, 1889928240, 1892501220, 1895068500,
  1897626120, 1900173540, 1902712920, 1905247260, 1907779380, 1910312040,
  1912848360, 1915392000, 1917946140, 1920511980, 1923086520, 1925663220,
  1928234880, 1930797060, 1933348980, 1935891660, 1938427200, 1940958180,
  1943488020, 1946020920, 1948561200, 1951112100, 1953674460, 1956245700,
  1958820840, 1961394300, 1963961280, 1966518660, 1969065480, 1971603240,
  1974135180, 1976665740, 1979199120, 1981738800, 1984286640, 1986843060,
  1989407340, 1991977560, 1994549940, 1997119140, 1999680240, 2002231260,
  2004773400, 2007310140, 2009845320, 2012382000, 2014922040, 2017466640,
  2020016940, 2022574020, 2025137520, 2027704800, 2030271420, 2032833300,
  2035388760, 2037938160, 2040483060, 2043025080, 2045565840, 2048106780,
  2050649760, 2053196280, 2055747300, 2058302640, 2060860920, 2063420820,
  2065981140, 2068540740, 2071098120, 2073651900, 2076201420, 2078747400,
  2081291700, 2083835880, 2086380600, 2088925860, 2091471840, 2094019860,
  2096571780, 2099128860, 2101690260, 2104253220, 2106814560, 2109372300,
  2111926200, 2114476680, 2117023560, 2119566600, 2122106100, 2124644160,
  2127184020, 2129728920, 2132281020, 2134840260, 2137404780, 2139971880,
  2142538620, 2145102000, 2147659320, 2150208660, 2152750260, 2155286280,
  2157819960, 2160354780, 2162893800, 2165439480, 2167993500, 2170556580,
  2173127340, 2175701520, 2178272820, 2180835660, 2183387820, 2185930500,
  2188466520, 2190999000, 2193530700, 2196064680, 2198604240, 2201153040,
  2203713480, 2206284720, 2208861540, 2211436560, 2214003660, 2216560380,
  2219107200, 2221645740, 2224178460, 2226708420, 2229239460, 2231775840,
  2234321460, 2236878480, 2239445880, 2242019580, 2244594120, 2247164460,
  2249726580, 2252278440, 2254820400, 2257354920, 2259885900, 2262417840,
  2264954580, 2267498700, 2270051040, 2272611300, 2275178340, 2277749460,
  2280320280, 2282885460, 2285441400, 2287987860, 2290527240, 2293063320,
  2295599640, 2298138540, 2300681220, 2303228640, 2305781880, 2308341540,
  2310906420, 2313473040, 2316037140, 2318595720, 2321148360, 2323695900,
  2326240080, 2328782220, 2331323640, 2333865840, 2336410380, 2338958580,
  2341510980, 2344066860, 2346625080, 2349184680, 2351744640, 2354303760,
  2356860360, 2359413120, 2361961740, 2364507360, 2367051720, 2369596020,
  2372140500, 2374685160, 2377230900, 2379779700, 2382333480, 2384892780,
  2387455800, 2390019240, 2392579980, 2395136700, 2397689460, 2400238380,
  2402783220, 2405323800, 2407861440, 2410399080, 2412940320, 2415488220,
  2418043920, 2420606520, 2423173440, 2425741560, 2428307820, 2430868980,
  2433422520, 2435967600, 2438505480, 2441039220, 2443572420, 2446108560,
  2448650400, 2451200160, 2453759040, 2456326800, 2458900620, 2461474680,
  2464042560, 2466600000, 2469146820, 2471685300, 2474218740, 2476750200,
  2479282560, 2481818940, 2484362940, 2486917680, 2489484120, 2492059260,
  2494636200, 2497207740, 2499769500, 2502320820, 2504862960, 2507398080,
  2509929060, 2512459260, 2514992760, 2517533700, 2520085200, 2522647800,
  2525218860, 2527793340, 2530365900, 2532932040, 2535488880, 2538035580,
  2540573520, 2543106120, 2545637520, 2548171980, 2550712620, 2553261060,
  2555817420, 2558380920, 2560949700, 2563520520, 2566088460, 2568648960,
  2571200160, 2573743080, 2576281020, 2578817580, 2581355700, 2583896880,
  2586442020, 2588991960, 2591547780, 2594109420, 2596674660, 2599239660,
  2601800940, 2604356700, 2606907300, 2609453820, 2611997820, 2614540260,
  2617082340, 2619625680, 2622171540, 2624721060, 2627274240, 2629830420,
  2632388640, 2634948180, 2637508140, 2640066900, 2642622720, 2645174400,
  2647722180, 2650267500, 2652811800, 2655355680, 2657899380, 2660443440,
  2662989480, 2665539840, 2668096140, 2670657840, 2673222180, 2675785560,
  2678345400, 2680900980, 2683452240, 2685999000, 2688541080, 2691079200,
  2693615640, 2696153880, 2698697640, 2701249140, 2703808680, 2706374400,
  2708943180, 2711511720, 2714076420, 2716634220, 2719183320, 2721724020,
  2724258780, 2726791260, 2729325000, 2731863420, 2734408920, 2736963360,
  2739527280, 2742099240, 2744674500, 2747246520, 2749809480, 2752361220,
  2754903060, 2757438300, 2759970060, 2762501400, 2765035380, 2767575240,
  2770124580, 2772685560, 2775257340, 2777834400, 2780409360, 2782976100,
  2785532280, 2788078500, 2790616620, 2793149280, 2795679540, 2798211120,
  2800748220, 2803294560, 2805851940, 2808419280, 2810992380, 2813566080,
  2816135400, 2818696740, 2821248360, 2823790440, 2826325500, 2828857320,
  2831390340, 2833928160, 2836473060, 2839025640, 2841585360, 2844151080,
  2846720580, 2849289840, 2851854120, 2854409940, 2856957000, 2859497520,
  2862035040, 2864572920, 2867113140, 2869656600, 2872203960, 2874756300,
  2877314220, 2879876940, 2882441700, 2885004720, 2887563300, 2890116780,
  2892665940, 2895212040, 2897756040, 2900298900, 2902841700, 2905385940,
  2907933000, 2910483480, 2913037200, 2915593500, 2918151960, 2920711740,
  2923271880, 2925830340, 2928385200, 2930935800, 2933482800, 2936027640,
  2938571460, 2941114680, 2943657480, 2946201240, 2948748300, 2951301000,
  2953860120, 2956424160, 2958989400, 2961552240, 2964110880, 2966664840,
  2969213940, 2971758120, 2974297440, 2976833520, 2979369540, 2981909520,
  2984456580, 2987012280, 2989575660, 2992144080, 2994714000, 2997281760,
  2999843700, 3002397240, 3004941540, 3007478340, 3010010880, 3012543060,
  3015078480, 3017620080, 3020170020, 3022729620, 3025298400, 3027873240,
  3030448140, 3033016260, 3035573460, 3038119560, 3040657260, 3043189980,
  3045721020, 3048253260, 3050789940, 3053334420, 3055889700, 3058456740,
  3061032180, 3063609060, 3066180240, 3068741460, 3071292120, 3073833840,
  3076368840, 3078900000, 3081430740, 3083964960, 3086506680, 3089058780,
  3091621440, 3094192020, 3096765600, 3099337080, 3101902260, 3104458560,
  3107005260, 3109543740, 3112077180, 3114609660, 3117145320, 3119686980,
  3122235840, 3124791960, 3127354320, 3129921480, 3132490500, 3135057180,
  3137617260, 3140168880, 3142712820, 3145252140, 3147790320, 3150329880,
  3152872080, 3155417520, 3157966920, 3160521240, 3163080780, 3165643980,
  3168207540, 3170768340, 3173324700, 3175876560, 3178425000, 3180970860,
  3183514980, 3186058080, 3188601480, 3191146560, 3193694400, 3196245480,
  3198799560, 3201356280, 3203915280, 3206475720, 3209036040, 3211593960,
  3214147740, 3216697200, 3219243360, 3221787480, 3224330340, 3226872420,
  3229414560, 3231958860, 3234507840, 3237063540, 3239625720, 3242191560,
  3244756980, 3247318860, 3249875880, 3252427680, 3254974140, 3257515140,
  3260051880, 3262586760, 3265123680, 3267666480, 3270217680, 3272777640,
  3275344560, 3277915020, 3280485060, 3283050780, 3285608820, 3288157440,
  3290697180, 3293230860, 3295762260, 3298295280, 3300833280, 3303378900,
  3305933820, 3308498580, 3311071500, 3313647660, 3316220040, 3318782880,
  3321334020, 3323875200, 3326409660, 3328940940, 3331472220, 3334006380,
  3336546780, 3339096660, 3341658180, 3344230200, 3346807320, 3349381860,
  3351947940, 3354503520, 3357049260, 3359587200, 3362120040, 3364650840,
  3367183200, 3369721140, 3372268200, 3374825880, 3377392800, 3379965000,
  3382537500, 3385105680, 3387666360, 3390217740, 3392760240, 3395296080,
  3397829040, 3400363320, 3402902280, 3405447900, 3408000420, 3410559360,
  3413123520, 3415691160, 3418258860, 3420822300, 3423378240, 3425926140,
  3428467980, 3431007120, 3433546620, 3436088100, 3438632220, 3441179340,
  3443730480, 3446286480, 3448847100, 3451410060, 3453972060, 3456530760,
  3459085320, 3461636280, 3464184360, 3466730220, 3469274340, 3471817620,
  3474361440, 3476907120, 3479455620, 3482007180, 3484561680, 3487119060,
  3489678960, 3492240240, 3494800620, 3497357700, 3499910220, 3502458420,
  3505003440, 3507546600, 3510088380, 3512629440, 3515171340, 3517716900,
  3520268700, 3522827880, 3525392940, 3527959980, 3530524920, 3533085240,
  3535640040, 3538189200, 3540732540, 3543270600, 3545805180, 3548339880,
  3550878780, 3553425300, 3555981120, 3558545400, 3561115260, 3563686740,
  3566255700, 3568818180, 3571371480, 3573915060, 3576450780, 3578982300,
  3581513640, 3584048580, 3586590120, 3589140480, 3591700740, 3594270360,
  3596846040, 3599421420, 3601989540, 3604546320, 3607091760, 3609628800,
  3612160980, 3614691840, 3617224320, 3619761480, 3622306500, 3624862380,
  3627429720, 3630005100, 3632581620, 3635152140, 3637712640, 3640262820,
  3642804300, 3645339420, 3647871120, 3650402580, 3652937760, 3655480260,
  3658032780, 3660595320, 3663165060, 3665737440, 3668307660, 3670871880,
  3673427820, 3675974760, 3678513960, 3681048420, 3683582220, 3686119140,
  3688661700, 3691210920, 3693766440, 3696327480, 3698892720, 3701460000,
  3704025480, 3706585260, 3709137420, 3711682560, 3714223500, 3716763420,
  3719304480, 3721847640, 3724393200, 3726941760, 3729494400, 3732051780,
  3734612880, 3737175060, 3739735500, 3742292580, 3744846060, 3747396480,
  3749944380, 3752490060, 3755034000, 3757577280, 3760121280, 3762667380,
  3765216300, 3767768400, 3770323800, 3772882380, 3775443540, 3778005480,
  3780565560, 3783121500, 3785672400, 3788219160, 3790762920, 3793304640,
  3795845100, 3798385440, 3800928060, 3803475960, 3806031240, 3808594020,
  3811161360, 3813728820, 3816292560, 3818850780, 3821402940, 3823948860,
  3826488840, 3829024140, 3831557640, 3834093420, 3836635500, 3839186520,
  3841747140, 3844315200, 3846887160, 3849458520, 3852025020, 3854583120,
  3857131080, 3859669920, 3862202580, 3864733140, 3867265620, 3869803500,
  3872349360, 3874904880, 3877470420, 3880044120, 3882620760, 3885193260,
  3887755740, 3890306340, 3892846800, 3895380780, 3897911820, 3900443220,
  3902977800, 3905518800, 3908069280, 3910631220, 3913203240, 3915779940,
  3918353820, 3920919240, 3923474220, 3926019660, 3928557660, 3931090920,
  3933622440, 3936155700, 3938694600, 3941242260, 3943799940, 3946366260,
  3948937320, 3951508380, 3954075420, 3956635440, 3959186880, 3961729980,
  3964266900, 3966801120, 3969336720, 3971876880, 3974423040, 3976975380,
  3979533180, 3982095600, 3984661260, 3987227400, 3989790120, 3992346300,
  3994895280, 3997438680, 3999979560, 4002520740, 4005063420, 4007607960,
  4010154600, 4012704300, 4015258320, 4017816720, 4020377940, 4022939220,
  4025498220, 4028054100, 4030606920, 4033157100, 4035704760, 4038250020,
  4040793540, 4043336640, 4045880820, 4048427280, 4050976800, 4053529680,
  4056086220, 4058646360, 4061208960, 4063771380, 4066330620, 4068884940,
  4071434040, 4073979120, 4076521380, 4079061660, 4081600980, 4084141260,
  4086685440, 4089236520, 4091795880, 4094362140, 4096931040, 4099497900,
  4102059660
]


def get_last_full_moon(d):
    """
    Returns the last full moon for d

    Raises ValueError if the d value is not between 2000 - 2099
    """

    now = d.int_timestamp
    idx = bisect.bisect_right(fullmoons, now)
    if idx in [0, len(fullmoons)]:
        raise ValueError(
            'watson has only full moon dates from year 2000 to 2099, not {}'
            .format(d.year))

    last = fullmoons[idx - 1]
    return arrow.get(last)