mirror/astronomy
1
0
Fork 0
mirror of https://github.com/cosinekitty/astronomy.git synced 2026-04-04 14:55:38 -04:00
Code Issues Packages Projects Releases Wiki Activity

Python: calling GeoMoon() without errors, but calculations not yet validated.

Browse Source
This commit is contained in:
Don Cross
2019-06-24 15:25:28 -04:00
parent 44b9d26d1d
commit 787812287c
4 changed files with 93 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
source/python/astronomy.py
View File

@@ -42,8 +42,15 @@ def _NormalizeLongitude(lon):
lon -= 360.0
return lon
def VectorLength(vector):
return math.sqrt(vector.x**2 + vector.y**2 + vector.z**2)
class Vector:
def __init__(self, x, y, z, t):
self.x = x
self.y = y
self.z = z
self.t = t
def Length(self):
return math.sqrt(self.x**2 + self.y**2 + self.z**2)
BODY_INVALID = -1
BODY_MERCURY = 0
@@ -116,7 +123,7 @@ def _SynodicPeriod(body):
return abs(_EARTH_ORBITAL_PERIOD / (_EARTH_ORBITAL_PERIOD/_PlanetOrbitalPeriod[body] - 1.0))
def _AngleBetween(a, b):
r = VectorLength(a) * VectorLength(b)
r = a.Length() * b.Length()
if r < 1.0e-8:
return BadVectorError()
dot = (a.x*b.x + a.y*b.y + a.z*b.z) / r
@@ -486,7 +493,7 @@ class _e_tilt:
self.tt = time.tt
self.ee = e.dpsi * math.cos(self.mobl * _DEG2RAD) / 15.0
def _ecl2equ_vec(time, ecl, equ):
def _ecl2equ_vec(time, ecl):
obl = _mean_obliq(time.tt) * _DEG2RAD
cos_obl = math.cos(obl)
sin_obl = math.sin(obl)
@@ -694,7 +701,7 @@ def _ter2cel(time, vec1):
# BEGIN CalcMoon
class _Array1:
def __init__(xmin, xmax):
def __init__(self, xmin, xmax):
self.min = xmin
self.array = [0] * (xmax - xmin + 1)
@@ -705,7 +712,7 @@ class _Array1:
self.array[key - self.min] = value
class _Array2:
def __init__(xmin, xmax, ymin, ymax):
def __init__(self, xmin, xmax, ymin, ymax):
self.min = xmin
self.array = [_Array1(ymin, ymax) for i in range(xmax - xmin + 1)]
@@ -756,11 +763,11 @@ def _CalcMoon(time):
-539E-9 * Sine(0.35498-5.37899*T)
-64E-9 * Sine(0.39943-5.37511*T)))
L0 = PI2*Frac(0.60643382+1336.85522467*T-0.00000313*T2) + DL0/ARC
L = PI2*Frac(0.37489701+1325.55240982*T+0.00002565*T2) + DL /ARC
LS = PI2*Frac(0.99312619+ 99.99735956*T-0.00000044*T2) + DLS/ARC
F = PI2*Frac(0.25909118+1342.22782980*T-0.00000892*T2) + DF /ARC
D = PI2*Frac(0.82736186+1236.85308708*T-0.00000397*T2) + DD /ARC
L0 = _PI2*Frac(0.60643382+1336.85522467*T-0.00000313*T2) + DL0/_ARC
L = _PI2*Frac(0.37489701+1325.55240982*T+0.00002565*T2) + DL /_ARC
LS = _PI2*Frac(0.99312619+ 99.99735956*T-0.00000044*T2) + DLS/_ARC
F = _PI2*Frac(0.25909118+1342.22782980*T-0.00000892*T2) + DF /_ARC
D = _PI2*Frac(0.82736186+1236.85308708*T-0.00000397*T2) + DD /_ARC
I = 1
while I <= 4:
@@ -793,7 +800,7 @@ def _CalcMoon(time):
def Term(p, q, r, s):
result = (1, 0)
I = [null, p, q, r, s]
I = [None, p, q, r, s]
k = 1
while k <= 4:
if I[k] != 0:
@@ -939,14 +946,32 @@ def _CalcMoon(time):
+0.24*Sine(0.2275 -5.7374*T)+0.28*Sine(0.2965 +2.6929*T)
+0.33*Sine(0.3132 +6.3368*T)
)
S = F + DS/ARC
S = F + DS/_ARC
lat_seconds = (1.000002708 + 139.978*DGAM)*(18518.511+1.189+GAM1C)*math.sin(S) - 6.24*math.sin(3*S) + N
return _moonpos(
_PI2 * Frac((L0+DLAM/ARC) / _PI2),
_PI2 * Frac((L0+DLAM/_ARC) / _PI2),
(math.pi / (180 * 3600)) * lat_seconds,
(ARC * (ERAD / AU)) / (0.999953253 * SINPI)
(_ARC * (_ERAD / _AU)) / (0.999953253 * SINPI)
)
# END CalcMoon
#----------------------------------------------------------------------------
def GeoMoon(time):
m = _CalcMoon(time)
# Convert geocentric ecliptic spherical coordinates to Cartesian coordinates.
dist_cos_lat = m.distance_au * math.cos(m.geo_eclip_lat)
gepos = [
dist_cos_lat * math.cos(m.geo_eclip_lon),
dist_cos_lat * math.sin(m.geo_eclip_lon),
m.distance_au * math.sin(m.geo_eclip_lat)
]
# Convert ecliptic coordinates to equatorial coordinates, both in mean equinox of date.
mpos1 = _ecl2equ_vec(time, gepos)
# Convert from mean equinox of date to J2000.
mpos2 = _precession(time.tt, mpos1, 0)
return Vector(mpos2[0], mpos2[1], mpos2[2], time)