@tubular/astronomy/dist/astro-constants.js

Astronomical calculations for planetary positions, moon phases, eclipses, rise, transit, and set times, and more.

import { Angle, SphericalPosition, Unit } from '@tubular/math';
export const JD_J2000 = 2451545.0; // Julian date for the J2000.0 epoch.
export const JD_B1950 = 2433282.4235; // Julian date for the B1950 epoch.
export const FIRST_PLANET = 0;
export const SUN = 0;
export const MERCURY = 1;
export const VENUS = 2;
export const EARTH = 3;
export const MARS = 4;
export const JUPITER = 5;
export const SATURN = 6;
export const URANUS = 7;
export const NEPTUNE = 8;
export const PLUTO = 9;
export const MOON = 10;
export const LAST_PLANET = 10;
export const NO_MATCH = Number.MIN_SAFE_INTEGER;
export const NO_SELECTION = NO_MATCH;
export const CANCEL_SELECTION = Number.MAX_SAFE_INTEGER;
// Flags for methods and adjustments to be applied to coordinate calculations.
//
export const LOW_PRECISION = 0x00000001; // For faster calculation when several arcseconds of error are acceptable.
export const HIGH_PRECISION = 0x00000002; // For highest available precision -- can be slow for such things as ELP 2000-82B.
export const NUTATION = 0x00000004; // Include effects of nutation.
export const TOPOCENTRIC = 0x00000008; // As opposed to geocentric
export const REFRACTION = 0x00000010; // Only applies to horizontal coordinates
export const QUICK_SUN = 0x00000020; // Use simple formula instead of VSOP
export const QUICK_PLANET = 0x00000040; // Use orbital elements instead of VSOP
export const ABERRATION = 0x00000080; // Full planetary aberration
export const ASTROMETRIC = 0x00000100; // Effect of light delay without aberration
export const TRUE_DISTANCE = 0x00000200; // Include true distance in otherwise light-delayed result
export const DELAYED_TIME = 0x00000400; // Return (T - tau) instead of distance
export const SIGNED_HOUR_ANGLE = 0x00000800; // Hour angle result +/- 12h, instead of 0-24h.
export const NO_PRECESSION = 0x00001000; // StarCatalog only: for results referred to J2000.0 equinox rather than equinox of date.
export const DEFAULT_FLAGS = 0x40000000; // Determine flags from context.
export const MIN_YEAR = -6000;
export const MAX_YEAR = 9999;
export const NON_EVENT = -1;
export const IN_BETWEEN_PHASES = -1;
export const PHASE_EVENT_BASE = 0;
export const NEW_MOON = 0;
export const FIRST_QUARTER = 1;
export const FULL_MOON = 2;
export const LAST_QUARTER = 3;
export const THIRD_QUARTER = 3;
export const NOT_EQUINOX_OR_SOLSTICE = -2;
export const EQ_SOLSTICE_EVENT_BASE = 100;
export const SPRING_EQUINOX = 100;
export const SUMMER_SOLSTICE = 101;
export const FALL_EQUINOX = 102;
export const WINTER_SOLSTICE = 103;
export const RISE_SET_EVENT_BASE = 200;
export const RISE_EVENT = 200;
export const SET_EVENT = 201;
export const VISIBLE_ALL_DAY = 202;
export const UNSEEN_ALL_DAY = 203;
export const TRANSIT_EVENT = 204;
export const TWILIGHT_BEGINS = 205;
export const TWILIGHT_ENDS = 206;
export const SET_EVENT_MINUS_1_MIN = 207;
export const PLANET_EVENT_BASE = 300;
export const OPPOSITION = 300;
export const SUPERIOR_CONJUNCTION = 301;
export const INFERIOR_CONJUNCTION = 302;
export const GREATEST_ELONGATION = 303;
export const PERIHELION = 304;
export const APHELION = 305;
export const QUADRATURE = 306;
export const ECLIPSE_EVENT_BASE = 400;
export const LUNAR_ECLIPSE = 400;
export const SOLAR_ECLIPSE = 401;
export const LUNAR_ECLIPSE_LOCAL = 402; // must be found using findEventAsync()
export const SOLAR_ECLIPSE_LOCAL = 403; // must be found using findEventAsync()
export const MOONS_EVENT_BASE = 500;
export const GALILEAN_MOON_EVENT = 500;
export const GRS_TRANSIT_EVENT_BASE = 600;
export const GRS_TRANSIT_EVENT = 600;
export const NO_TWILIGHT = 0;
export const CIVIL_TWILIGHT = -6;
export const NAUTICAL_TWILIGHT = -12;
export const ASTRONOMICAL_TWILIGHT = -18;
export const MAX_ALT_FOR_TWILIGHT = CIVIL_TWILIGHT;
export const EARTH_RADIUS_KM = 6378.14; // equatorial radius
export const EARTH_RADIUS_POLAR_KM = 6356.755;
export const SUN_RADIUS_KM = 696000;
export const MOON_RADIUS_KM = 1737.4;
export const KM_PER_AU = 1.49597870691E8;
export const LIGHT_DAYS_PER_AU = 0.005775518328;
export const MEAN_JUPITER_SYS_II = 0.4137042242;
export const MEAN_SYNODIC_MONTH = 29.530589;
export const REFRACTION_AT_HORIZON = 0.5833; // in degrees
export const AVG_SUN_MOON_RADIUS = 0.25; // in degrees
export const UNKNOWN_MAGNITUDE = 10000;
export const OBLIQUITY_J2000 = 23.43929111; // in degrees
export const K_DEG = 0.98560766860142; // Gaussian gravitation in degrees.
export const K_RAD = K_DEG * Math.PI / 180; // Gaussian gravitation in radians.
export const INCLINATION_MEAN_LUNAR_EQUATOR = 1.54242;
export const GALACTIC_NORTH_B1950 = new SphericalPosition(192.25, 27.4, Unit.DEGREES, Unit.DEGREES);
export const GALACTIC_ASCENDING_NODE_B1950 = new Angle(33, Unit.DEGREES);
export const DAY = 1;
export const HALF_DAY = 0.5;
export const HOUR = 1 / 24;
export const HALF_HOUR = 1 / 48;
export const QUARTER_HOUR = 1 / 96;
export const MINUTE = 1 / 1440;
export const HALF_MINUTE = 1 / 2880;
export const SECOND = 1 / 86400;
export const HALF_SECOND = 1 / 172800;
export const JUPITER_FLATTENING = 1.069303;
export const FIRST_JUPITER_MOON = 5001;
export const IO = 5001;
export const EUROPA = 5002;
export const GANYMEDE = 5003;
export const CALLISTO = 5004;
export const LAST_JUPITER_MOON = 5004;
export const SATURN_FLATTENING = 1.120699;
export const FIRST_SATURN_MOON = 6001;
export const MIMAS = 6001;
export const ENCELADUS = 6002;
export const TETHYS = 6003;
export const DIONE = 6004;
export const RHEA = 6005;
export const TITAN = 6006;
export const HYPERION = 6007;
export const IAPETUS = 6008;
export const LAST_SATURN_MOON = 6008;
export const ASTEROID_BASE = 20000; // First asteroid will be ASTEROID_BASE + 1
export const ASTEROID_MAX = 29999;
export const COMET_BASE = 30000; // First comet will be COMET_BASE + 1
export const COMET_MAX = 39999;
export const SOLAR_SYSTEM_MAX = COMET_MAX;
export const CONSTELLATION_BASE = 100000;
export const CONSTELLATION_MAX = 100999;
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