quantum/punyverse
1
0
Fork 0
mirror of https://github.com/quantum5/punyverse.git synced 2025-04-24 13:11:57 -04:00
Code Issues Packages Projects Releases Wiki Activity

Use the faster Newton's method for eccentric anomaly.

Browse source 
Newton's method also converges quickly for highly eccentric orbits.
This commit is contained in:
Quantum 2018-08-23 21:49:38 -04:00
parent 2aed23c4ae
commit a862302408
1 changed files with 4 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
punyverse/orbit.py
View file

@ -66,10 +66,11 @@ class KeplerOrbit(object):
self.__cos_argument = cos(self._argument)
def eccentric_anomaly(self, mean_anomaly):
e1 = mean_anomaly
e2 = mean_anomaly + self.eccentricity * sin(e1)
e1 = 0
e2 = mean_anomaly
while abs(e1 - e2) > 0.000001:
e1, e2 = e2, mean_anomaly + self.eccentricity * sin(e2)
e1, e2 = e2, e2 - ((e2 - mean_anomaly - self.eccentricity * sin(e2)) /
(1 - self.eccentricity * cos(e2)))
return e2
def true_anomaly(self, mean_anomaly):